EE-HQ-83884 Serials EBF 164 B2-H0-B3894-EBF 1B4 FBI - CENTRAL RECORDS CENTER HQ - HEADQUARTERS Class / Case # SubVol.Serial # 0062 838941164ONLY EBF #■ 8/11/1274166 RRP003IXG8 Declassification authority derived from FBI Automatic Declassification Guide, issued May 24, 2007. RESTRICTED D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG EN CE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG EN CE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO N VENTIO N A L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called “Flying D iscs.” b. To establish procedures for reporting such information. 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TIN G a. G eneral (1) A s complete an answer to the requirements enunciated in Part H , as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, “Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N , O H IO , A TTN : M CIA XO -3.” RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command H eadquarters of the installation concerned. (3) A copy of all reports sent to A ir M ateriel Command in accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever commimications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T n - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. A ir (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch if possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time in sight. 8. A ppearance of object. a. Color. b. S hape. (S ketch if possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size. (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. . I: 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. ' b. L ength and width. RESTRICTED - 3 - RESTRICTED c. O dor (if any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a. W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer. 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings in general. b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. W itnesses. a. A ddressees. b. O ccupation. c. R eliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. N ote particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G EN ER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4 . Possible releases of testing devices in vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 . If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; if not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where it contacted earth (if this happened). d. M aneuvers. e. Formation if objects were more than two. 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (IN T), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - R E S TR IC TE D RESTRICTED D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG ENCE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG EN CE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO N VEN TIO N A L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying D iscs.” b. To establish procedures for reporting such information. 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TING a. G eneral (1) A s complete an answer to the requirements enunciated in Part n, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, “Pass to CO M G ENA M C W R IG H T-PA TTER S O N A FB, D A Y TO N , O H IO , A TTN : M CIA X0-3.” RESTRICTED C 9-4892.A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CL A XO -3 by installations receiv­ ing Information pertaining to the requirements enunciated In Part II. (2) Copies of such reports may be supplied the Command H eadquarters of the Installation concerned. (3) A copy of all reports sent to A ir M ateriel Command in accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of Information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor Involved in transmission of this type of information It is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T II - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. A ir (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark, (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch if possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time in sight. 8. A ppearance of object. a. Color. b. S hape. (S ketch if possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size. (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. ' b. L ength and width. RESTRICTED - 3 - RESTRICTED c. O dor (if any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13, L ights, a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a. W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer. 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings In general. b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. W itnesses. a. A ddressees. b. O ccupation. c. R eliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was Its speed? c. N ote particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G EN ER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3, L ocal flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4 . Possible releases of testing devices In vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 , If object contacted earth, obtain soli samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils, 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; if not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where It contacted earth (if this happened). d. M aneuvers. e. Formation if objects were more than two. 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (IN T), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - R E S TR IC TE D R E S TR IC TE D RESTRICTED D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG EN CE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG EN CE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO N VEN TIO N A L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called “Flying D iscs.” b. To establish procedures for reporting such information. 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TING a* G sneral (1) A s complete an answer to the requirements enunciated In Part H , as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b, M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, “Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N, O H IO , A TTN : M CIA XO -3.” RESTRICTED C 9-4892.A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing information pertaining to the requirements enunciated In Part II. (2) Copies of such reports may be supplied the Command H eadquarters of the installation concerned. (3) A copy of all reports sent to A ir M ateriel Command in accordance with these Instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control In connection with the develop­ ment of information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T n - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. A ir (!) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch If possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such Information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time in sight. 8, A ppearance of object. a. Color. b. S hape. (S ketch if possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size. (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11, Evidence of exhaust. a. Color of smoke. ' b. L ength and width. RESTRICTED - 3 - RESTRICTED c. O dor (If any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists, c. R eflected on cloud. d. S howed thru cloud. 13, L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a. W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability, a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19, S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1, N ame of observer. 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6, A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings In general. b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. W itnesses. a. A ddressees. b. O ccupation. c. R eliability. 10, Comments of interrogator regarding the intelligence and character of person interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. N ote particularly any separation of distant target Into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G EN ER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4 . Possible releases of testing devices In vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 . If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; if not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where it contacted earth (if this happened). d. M aneuvers. e. Formation if objects were more than two. 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). (^ ^ d^O ^& C __ C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (IN T), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - RESTRICTED D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG ENCE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG ENCE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO NVEN TIO N A L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called “Flying D iscs.” b. To establish procedures for reporting such information. 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 2 5 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TIN G a. G eneral (1) A s complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings, (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the Importance of the information reported. b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, “Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N , O H IO , A TTN : M CIA XO -3.” a? - z^^^^-zzz RESTRICTED C 9-4892.A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing Information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command H eadquarters of the Installation concerned. (3) A copy of all reports sent to A ir M ateriel Command In accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor involved in transmission of this type of information It is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T n - R EQ UIR EM EN TS G eneral 1, D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. A *r (1) Type aircraft, speed, altitude, direction of flight, (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch If possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. D istance of object from observer. a. L aterally or horizontally, b. A ngle of elevation from horizon. c. A ltitude, 7. Time In sight. 8. A ppearance of object. a. Color. b. S hape. (S ketch if possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size. (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. ' b. L ength and width. RESTRICTED - 3 - RESTRICTED c. O dor (if any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a. W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20, M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer. 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer, a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings in general. b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. W itnesses, a. A ddressees. b. O ccupation. c. R eliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc, and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was Its speed? c. N ote particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G EN ER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying In vicinity at the time. (Check Canadian activity If close to that border.) 4 , Possible releases of testing devices in vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 . If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; If not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where it contacted earth (if this happened). d. M aneuvers. e. Formation if objects were more than two. 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible, 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (IN T), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - RESTRICTED D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG EN CE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG EN CE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO NVEN TIO N A L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called “Flying D iscs.” b. To establish procedures for reporting such information. 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TING a. G eneral (1) A s complete an answer to the requirements enunciated in Part n, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, “Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N , O H IO , A TTN : M CIA XO -3.” RESTRICTED C 9-4892, A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command H eadquarters of the Installation concerned. (3) A copy of all reports sent to A ir M ateriel Command in accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T n - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. A ir (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch if possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time in sight. 8. A ppearance of object. a. Color. b. S hape. (S ketch if possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size. (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. ' b. L ength and width. RESTRICTED - 3 - RESTRICTED c, O dor (if any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds, a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a. W ings, b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer. 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings In general. b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. W itnesses. a. A ddressees. b. O ccupation. c. R eliability. 10. Comments of interrogator regarding the intelligence and character of person Interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay In the turn and what was its speed? c. N ote particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar Inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G ENER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying In vicinity at the time. (Check Canadian activity if close to that border.) 4 . Possible releases of testing devices in vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 , If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; if not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where it contacted earth (if this happened). d. M aneuvers. e. Formation if objects were more than two. 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). (2- ^ (2^t> ^e^— C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (IN T), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - R E S TR IC TE D R E S TR IC TE D RESTRICTED D EPA R TM ENT O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG EN CE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG ENCE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO N VEN TIO N A L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called “Flying D iscs.” b. To establish procedures for reporting such information, 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TIN G a. G eneral (1) A s complete an answer to the requirements enunciated in Part n, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported, b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, “Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N , O H IO , A TTN : M CIA XO -3.” RESTRICTED 09-4892,A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject, c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing Information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command H eadquarters of the Installation concerned. (3) A copy of all reports sent to A ir M ateriel Command in accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T IT - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. A ir (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land, (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch if possible, 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time in sight. 8. A ppearance of object. a. Color. b. S hape. (S ketch If possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size. (2) S ize as It appeared from observer's view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke, ' b. L ength and width. RESTRICTED - 3 - RESTRICTED C. O dor (If any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a. W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet, b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control arid stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer, 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged In hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8, N otes relative to observer on: a. S ightings in general. b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. W itnesses. a. A ddressees, b. O ccupation. c. R eliability. 10. Comments of interrogator regarding the intelligence and character of person Interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. N ote particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G EN ER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity If close to that border.) 4 . Possible releases of testing devices in vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 . If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; if not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where it contacted earth (if this happened). d. M aneuvers. e. Formation if objects were more than two. 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). ^ /? (2-< ^ee_^ C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (IN T), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - RESTRICTED D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG ENCE W A S H ING TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG EN CE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO N VEN TIO N A L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called “Flying D iscs.” b. To establish procedures for reporting such information. 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TIN G a. G eneral (1) A s complete an answer to the requirements enunciated in Part n, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the Information reported. b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, “Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N , O H IO , A TTN : M CIA XO -3,” RESTRICTED C i-W M .A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control In connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command H eadquarters of the Installation concerned. (3) A copy of all reports sent to A ir M ateriel Command in accordance with these Instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command Is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor Involved in transmission of this type of Information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T H - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b- A ir (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch if possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time in sight. 8, A ppearance of object. a. Color. b. S hape. (S ketch if possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size. (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. 'b. L ength and width. RESTRICTED - 3 - RESTRICTED c. O dor (if any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a. W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer. 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings in general. b. H ow attention was drawn to object (s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting in cases where observer Is airborne. 9. W itnesses. a. A ddressees. b. O ccupation. c. R eliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. N ote particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G EN ER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying In vicinity at the time. (Check Canadian activity if close to that border.) 4 . Possible releases of testing devices in vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 . If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; If not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where it contacted earth (If this happened). d. M aneuvers. e. Formation if objects were more than two. 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (INT), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - RESTRICTED D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG EN CE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG ENCE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO NVENTIO NA L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, Including the so-called “Flying D iscs.” b. To establish procedures for reporting such information. 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TIN G a. G eneral (1) A s complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission Immediately after sightings. (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, “Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N , O H IO , A TTN : M CIA XO -3.” RESTRICTED C 9-4892,A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command Is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing information pertaining to the requirements enunciated In Part n. (2) Copies of such reports may be supplied the Command H eadquarters of the installation concerned. (3) A copy of all reports sent to A ir M ateriel Command in accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this subject, ^ N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T n - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, Intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. A ir (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. ^ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch if possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time in sight. 8. A ppearance of object. a. Color. b. S hape. (S ketch if possible) c. A pparent construction, (O f what material or substance) d. S ize. (1) Estimated size, (2) S ize as It appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. ' b. L ength and width. RESTRICTED - 3 - RESTRICTED c. O dor (if any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a. W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh, c. Intermittent. 20. M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer. 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings in general. b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. W itnesses. a. A ddressees. b. O ccupation. c. R eliability. 10. Comments of interrogator regarding the intelligence and character of person Interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. N ote particularly any separation of distant target Into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G ENER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying In vicinity at the time. (Check Canadian activity if close to that border.) 4 . Possible releases of testing devices in vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 . If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; if not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where it contacted earth (if this happened). d. M aneuvers. e. Formation if objects were more than two. 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (INT), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - R E S TR IC TE D R E S TR IC TE D | RESTRICTED D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG EN CE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG ENCE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO N VEN TIO N A L A IR CR A FT PA R T 1 - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, Including the so-called "Flying D iscs,*’ b. To establish procedures for reporting such information. 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TING a. G eneral (1) A s complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings, (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported, b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, "Pass to CO M G ENA M C W R IG H T-PA TTER S O N A FB, D A Y TO N, O H IO , A TTN: M CIA XO -3.” /^- g> 3?^'^^ RESTRICTED C 9-W 92.A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing information pertaining to the requirements enunciated In Part II, (2) Copies of such reports may be supplied the Command H eadquarters of the installation concerned. (3) A copy of all reports sent to A ir M ateriel Command in accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of Information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor involved in transmission of this type of Information it Is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T H - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3, W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, Intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. A ir (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer's aircraft. (4 ) L atitude and longitude. c. (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch if possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such Information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time in sight. 8. A ppearance of object. a. Color. b. S hape. (S ketch if possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size. (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11, Evidence of exhaust. a. Color of smoke. ' b. L ength and width. RESTRICTED - 3 - RESTRICTED c, O dor (if any), d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a, W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer. 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings in general. b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting In cases where observer is airborne. 9. W itnesses. a. A ddressees. b. O ccupation. c. R eliability. 10. Comments of interrogator regarding the Intelligence and character of person interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. N ote particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G EN ER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity If close to that border.) 4 . Possible releases of testing devices In vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 . If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc, 7. O btain photographs (or original negatives) where available; if not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where it contacted earth (if this happened). d. M aneuvers. e. Formation if objects were more than two, 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (INT), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - RESTRICTED D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG EN CE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG EN CE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO N VENTIO N A L A IR CR A FT PART I - GENERAL PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called “Flying D iscs.” b. To establish procedures for reporting such information, 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3, R EPO R TIN G a. G eneral (1) A s complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings, (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, “Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N , O H IO , A TTN : M CIA XO -3.” Z^' ^^^ ^^-/^Z RESTRICTED C 9-4892,A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing information pertaining to the requirements enunciated In Part II. (2) Copies of such reports may be supplied the Command H eadquarters of the installation concerned. (3) A copy of all reports sent to A ir M ateriel Command in accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor Involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T II - R EQ UIR EM ENTS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, Intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (If feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. A ir (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch if possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such Information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time in sight. 8. A ppearance of object. a. Color. b. S hape. (S ketch if possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size. (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. ' b. L ength and width. RESTRICTED - 3 - RESTRICTED c. O dor (if any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a. W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer. 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings in general. b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. W itnesses. a. A ddressees. b. O ccupation. c. R eliability. 10. Comments of interrogator regarding the Intelligence and character of person interrogated. R elative to R adar S ightings 1, R e radars operating on ground. * a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. N ote particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar Inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G EN ER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying In vicinity at the time. (Check Canadian activity If close to that border.) 4 . Possible releases of testing devices in vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 . If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; if not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where It contacted earth (if this happened). d. M aneuvers, e. Formation If objects were more than two. 8, S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (INT), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG EN CE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG EN CE R EQ UIR EM ENTS M EM O R A N D UM N UM BER 4 UN CO N VEN TIO N A L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, Including the so-called “Flying D iscs.” b. To establish procedures for reporting such Information. 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TIN G a. G eneral (1) A s complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission Immediately after sightings. (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the Importance of the information reported. b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, “Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N , O H IO , A TTN: M CIA XO -3.” RESTRICTED C O -4892,A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command H eadquarters of the installation concerned. (3) A copy of all reports sent to A ir M ateriel Command in accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command Is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of Information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand, PA R T H - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. A ir (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch if possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time in sight. 8. A ppearance of object. a. Color. b. S hape. (S ketch if possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size. (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. ' b. L ength and width. RESTRICTED - 3 - RESTRICTED c. O dor (if any), d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 , S upport a. W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18, S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer. 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED _ 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings in general. b. H ow attention was drawn to object(s), (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. W itnesses. a. A ddressees. b. O ccupation. c. R eliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay In the turn and what was its speed? c. N ote particularly any separation of distant target Into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G EN ER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying In vicinity at the time. (Check Canadian activity if close to that border.) 4 . Possible releases of testing devices In vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 . If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc, 7. O btain photographs (or original negatives) where available; if not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where it contacted earth (If this happened), d. M aneuvers. e. Formation if objects were more than two. 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (INT), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - RESTRICTED D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG EN CE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG EN CE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO N VEN TIO N A L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called “Flying D iscs.” b. To establish procedures for reporting such information. 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TIN G a- G eneral (1) A s complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, "Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N , O H IO , A TTN : M CIA XO -3.” ^-F ltm -/^ RESTRICTED 09-4892,A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing Information pertaining to the requirements enunciated in Part H . (2) Copies of such reports may be supplied the Command H eadquarters of the installation concerned. (3) A copy of all reports sent to A ir M ateriel Command in accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control In connection with the develop­ ment of information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T H - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. A ir (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch if possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time In sight. 8. A ppearance of object. a. Color. b. S hape. (S ketch if possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size. (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. ! I’ a. Color of smoke. ' b. L ength and width. RESTRICTED - 3 - RESTRICTED c. O dor (if any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 , S upport a. W ings, b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible), 15 , Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer. 2, A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged In hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings in general. b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. W itnesses. a. A ddressees. b. O ccupation. c. R eliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. N ote particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G ENER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying In vicinity at the time, (Check Canadian activity if close to that border.) 4 . Possible releases of testing devices in vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 , If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; if not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where it contacted earth (if this happened). d. M aneuvers. e. Formation If objects were more than two. 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). (2. /^ C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (IN T), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - RESTRICTED D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG EN CE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG ENCE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO NVEN TIO N A L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying D iscs.” b. To establish procedures for reporting such information. 2. rescission D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TIN G a‘ $££££^ (1) A s complete an answer to the requirements enunciated in Part n, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, ‘‘Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N, O H IO , A TTN : M CIA XO -3.” /^- ? 3 P ?*'-S S ^ RESTRICTED C 9-H 892.A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing information pertaining to the requirements enunciated In Part II. (2) Copies of such reports may be supplied the Command H eadquarters of the installation concerned. (3) A copy of all reports sent to A ir M ateriel Command In accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this subject. d. N on-A ir Force A gencies (1) A ddressees otljer than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor Involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T U - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, Intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (If feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b, A ir (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch if possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time in sight. 8. A ppearance of object. a. Color. b. S hape. (S ketch if possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size. (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. i b. L ength and width. RESTRICTED - 3 - RESTRICTED c. O dor (if any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a. W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance, a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer. 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8, N otes relative to observer on: a. S ightings in general. b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. W itnesses, a. A ddressees. b. O ccupation. c. R eliability. 10. Comments of interrogator regarding the intelligence and character of person Interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. N ote particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G ENER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying In vicinity at the time. (Check Canadian activity If close to that border.) 4 . Possible releases of testing devices in vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 . If object contacted earth, obtain soli samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; if not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where it contacted earth (if this happened). d. M aneuvers. e. Formation if objects were more than two. 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (IN T), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - R E S TR IC TE D R E S TR IC TE D RESTRICTED D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG ENCE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG EN CE R EQ UIR EM ENTS M EM O R A N D UM N UM BER 4 UN CO N VEN TIO N A L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying D iscs.” b. To establish procedures for reporting such information. 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TING a. G eneral (1) A s complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, “Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N , O H IO , A TTN : M CIA XO -3.” RESTRICTED C 9-W 92.A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by Installations receiv­ ing Information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command H eadquarters of the Installation concerned. (3) A copy of all reports sent to A ir M ateriel Command In accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor involved in transmission of this type of Information It is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T H - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr, clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch If possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such Information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time In sight. 8. A ppearance of object. a. Color. b. S hape. (S ketch If possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size. (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. ' b. L ength and width. RESTRICTED - 3 - RESTRICTED c. O dor (if any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a. W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer. 2. A ddress, 3. O ccupation. 4 . Place of business. a. Employer or employee, 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings in general. b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting In cases where observer Is airborne. 9, W itnesses. a. A ddressees. b. O ccupation. c. R eliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. N ote particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar Inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G EN ER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3, L ocal flight schedules of commercial, private and military aircraft flying In vicinity at the time. (Check Canadian activity if close to that border.) 4 . Possible releases of testing devices in vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 . If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; If not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where it contacted earth (If this happened). d. M aneuvers. e. Formation If objects were more than two. 8, S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (INT), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - R E S TR IC TE D R E S TR IC TE D RESTRICTED D EPA R TM ENT O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG EN CE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG EN CE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO N VEN TIO N A L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called “Flying D iscs.’1 b. To establish procedures for reporting such information. 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TIN G a. G eneral (1) A s complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, “Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N , O H IO , A TTN : M CIA XO -3.” RESTRICTED C 9-4892.A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject, c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing information pertaining to the requirements enunciated in Part 11, (2) Copies of such reports may be supplied the Command H eadquarters of the installation concerned. (3) A copy of all reports sent to A ir M ateriel Command in accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor involved In transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T H - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. A ir (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch if possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time in sight. 8. A ppearance of object. a. Color. b. S hape. (S ketch if possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size, (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. ' b. L ength and width. RESTRICTED - 3 - RESTRICTED c. O dor (if any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a. W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots, b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance, a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer, 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings in general, b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. W itnesses. a. A ddressees. b. O ccupation. c. R eliability. 10. Comments of Interrogator regarding the Intelligence and character of person interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. N ote particularly any separation of distant target Into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G ENER A L 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity If close to that border.) 4 . Possible releases of testing devices In vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 . If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; if not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where It contacted earth (if this happened). d. M aneuvers. e. Formation if objects were more than two. 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). ^ /^ (2^c^t^c_ C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (INT), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - R E S TR IC TE D R E S TR IC TE D RESTRICTED D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG EN CE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG ENCE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO N VEN TIO N A L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called “Flying D iscs,” b. To establish procedures for reporting such information. 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 ,1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded, 3. R EPO R TING a. G eneral (1) A s complete an answer to the requirements enunciated in Part II, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings. (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the Information reported. b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force. Cables will contain the phase, “Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N, O H IO , A TTN : M CIA XO -3.” (J' F ltw -/^ RESTRICTED C 9**892,*F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing information pertaining to the requirements enunciated In Part II. (2) Copies of such reports may be supplied the Command H eadquarters of the installation concerned. (3) A copy of all reports sent to A ir M ateriel Command in accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor involved in transmission of this type of Information it Is requested that, wherever commxmlcations facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T H - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a. G round (1) City, town. (2) D istance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED b. A ir (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark. (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch if possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time in sight. 8. A ppearance of object. a. Color. b. S hape, (S ketch if possible) C. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size, (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. ' b. L ength and width. RESTRICTED - 3 - RESTRICTED c. O dor (if any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds. a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached, b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a. W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer. 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee. 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6. A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings in general. b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting In cases where observer is airborne. 9. W itnesses. a. A ddressees. b. O ccupation. c. R eliability. 10. Comments of interrogator regarding the intelligence and character of person Interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. N ote particularly any separation of distant target into several targets upon approach. Track all If possible. 2. If airborne when object sighted. a. W ere there any radar inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. G ENER A L 1. Teletype sequences of local weather conditions. 3. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity If close to that border.) 4 . Possible releases of testing devices in vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 . If object contacted earth, obtain soli samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; if not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where it contacted earth (if this happened). d. M aneuvers. e. Formation if objects were more than two. 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, i.e., (any projections or extentions that might presum­ ably be construed as such). C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (IN T), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - R E S TR IC TE D R E S TR IC TE D D EPA R TM EN T O F TH E A IR FO R CE H EA D Q UA R TER S UN ITED S TA TES A IR FO R CE D IR ECTO R A TE O F IN TEL L IG EN CE W A S H IN G TO N 25 , D . C. 15 February 194 9 A IR IN TEL L IG ENCE R EQ UIR EM EN TS M EM O R A N D UM N UM BER 4 UN CO N VEN TIO N A L A IR CR A FT PA R T I - G EN ER A L 1. PUR PO S E The purpose of this memorandum is twofold: a. To enunciate continuing A ir Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called “Flying D iscs.” b. To establish procedures for reporting such information. 2. R ES CIS S IO N D epartment of the A rmy Collection M emorandum N umber 7, dated 21 January 194 8, and letter, CS G ID 4 25 .1, dated 25 M arch 194 8, both subject as above, which have been transferred to A ir Force agencies for action, are herewith superseded. 3. R EPO R TIN G a. G eneral (1) A s complete an answer to the requirements enunciated in Part n, as may be procur­ able, should be dispatched by means of electrical transmission immediately after sightings, (2) S upplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the Information reported. b. M ajor A ir Commands (O verseas) and A ir A ttaches (1) Initial and supplementary cabled reports will be transmitted to the D irector of Intelli­ gence, H eadquarters United S tates A ir Force, Cables will contain the phase, “Pass to CO M G EN A M C W R IG H T-PA TTER S O N A FB, D A Y TO N , O H IO , A TTN : M CIA XO -3.” RESTRICTED C 9-4892,A F RESTRICTED (2) S upplementary written reports, prepared on A F Form 112, will be forwarded to the D irector of Intelligence, H eadquarters United S tates A ir Force. (3) Commanding G eneral, A ir M ateriel Command Is authorized direct contact with major A ir Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. M ajor A ir Commands (ZI) (1) R eports will be forwarded direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3 by installations receiv­ ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command H eadquarters of the installation concerned. (3) A copy of all reports sent to A ir M ateriel Command in accordance with these instruc­ tions will be forwarded at the same time to the D irector of Intelligence, H eadquarters United S tates A ir Force. (4 ) W ritten reports will be submitted on A F Form 112. (5 ) Commanding G eneral, A ir M ateriel Command is authorized direct contact with major A ir Commands (ZI) and organizations under their control in connection with the develop­ ment of information on this subject. d. N on-A ir Force A gencies (1) A ddressees other than those of the United S tates A ir Force are requested to forward reports direct to the Commanding G eneral, A ir M ateriel Command, W right-Patterson A ir Force Base, D ayton, O hio, A ttn: M CIA XO -3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding G eneral, A ir M ateriel Com­ mand. PA R T H - R EQ UIR EM EN TS G eneral 1. D ate of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. W here sighted (observer’s position): a’ G round (1) City, town. (2) D istance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4 ) M ap coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED RESTRICTED A ir (1) Type aircraft, speed, altitude, direction of flight. (2) D istance and direction from city, town or known landmark, (3) Clock position of object from observer’s aircraft. (4 ) L atitude and longitude. c. S ea (1) L atitude and longitude. (2) Proximity to land. (N ame city, country, etc.) 4 . N umber of objects. Formation type (if any), sketch if possible. 5 . O bservable celestial phenomena or planets that may account for the sighting. (L ocal facilities or organizations which follow such celestial phenomena should be consulted for such Information.) 6. D istance of object from observer. a. L aterally or horizontally. b. A ngle of elevation from horizon. c. A ltitude. 7. Time in sight. 8, A ppearance of object. a. Color. b. S hape. (S ketch if possible) c. A pparent construction. (O f what material or substance) d. S ize. (1) Estimated size. (2) S ize as it appeared from observer’s view. (Compared to known object) 9. D irection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. ' b. L ength and width. RESTRICTED - 3 - RESTRICTED c. O dor (if any). d. R ate of evaporation. e. D oes trail vary with sound? (spurts) 12. Effect on clouds, a. O pened path thru clouds. b. Forced cloud or mists. c. R eflected on cloud. d. S howed thru cloud. 13. L ights. a. R eflected or attached. b. L uminous c. Blinked on and off in relation to speed. 14 . S upport a. W ings. b. A erodynamic list of fuselage. c. Vertical jet. d. R otating cylinder or cone. e. A erostatic lift (balloon or dirigible). 15 . Propulsion. a. Propeller or jet. b. R otor. c. A erodynamic vanes (flapping or oscillating) (K atz M ayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. S tabilizers (horizontal or vertical). (1) S ize. (2) S hape. (3) L ocation. - 4 - RESTRICTED RESTRICTED 17. A ir ducts. a. S lots. b. D uct openings. 18. S peed - M .P.H . 19. S ound. a. Continuous whine or buzz. b. R oar, whistle, whoosh. c. Intermittent. 20. M anner of disappearance. a. Explode. (1) Possibility of fragments. (2) O ther physical evidence. b. Faded from view. c. D isappeared behind obstacle. R elative to the O bserver 1. N ame of observer. 2. A ddress. 3. O ccupation. 4 . Place of business. a. Employer or employee, 5 . Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. L ength of time engaged in hobby (experience). 6, A bility to determine: a. Color. b. S peed of moving objects. c. S ize at distance. 7. R eliability of observer. a. S ources. RESTRICTED - 5 - RESTRICTED (1) N eighbors. (2) Police D ept. (3) FBI records. (4 ) Employer. 8. N otes relative to observer on: a. S ightings in general. b. H ow attention was drawn to object(s). (1) S ound. (2) M otion. (3) G lint of light. c. D egree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. W itnesses. a. A ddressees. b. O ccupation, c. R eliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. R elative to R adar S ightings 1. R e radars operating on ground. a. O bservations of range, speed, altitude and size of target. b. D id target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay In the turn and what was its speed? c. N ote particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. W ere there any radar Inductions or extra noise on radio circuits? b. G ive estimates of size, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. W inds aloft report. - 6 - RESTRICTED RESTRICTED 3. L ocal flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity If close to that border.) 4 . Possible releases of testing devices In vicinity sent aloft by O rdnance, N avy, A ir Force, A rmy, W eather Units, R esearch O rganizations or any other. 5 . If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with G eiger counters for possible radioactivity. M ake comparisons with other unaffected aircraft objects, etc. 7. O btain photographs (or original negatives) where available; if not, secure sketches of: a. O bject. b. S urrounding terrain where observed. c. Place where it contacted earth (if this happened). d. M aneuvers. e. Formation if objects were more than two. 8. S ecure signed statement. 9. O btain fragments or physical evidence where possible. 10. W as any radio antenna to be observed, l.e., (any projections or extentions that might presum­ ably be construed as such). C. P. CA BEL L M ajor G eneral, US A F D irector of Intelligence, O ffice of D eputy Chief of S taff, O perations D IS TR IBUTIO N : Commanding G enerals, M ajor A ir Commands, ZI and O verseas A ll United S tates A ir A ttaches D irector of Central Intelligence S pecial A ssistant for R esearch and Intelligence, D epartment of S tate D irector of Intelligence, G S US A Chief of N aval Intelligence Commandant (IN T), United S tates Coast G uard D irector, Federal Bureau of Investigation RESTRICTED - 7 - R E S TR IC TE D R E S TR IC TE D