Documents / Official release

65 HS1-834228961 62-HQ-83894 Serial 164

Federal Bureau of Investigation · 137 pages · text from the file's own layer

This FBI file serial from case 62-HQ-83894 holds several copies of Air Intelligence Requirements Memorandum Number 4, "Unconventional Aircraft." Major General C. P. Cabell, Director of Intelligence at Headquarters United States Air Force, issued the memorandum on 15 February 1949. It sets continuing Air Force requirements for information on unidentified flying objects, including "Flying Discs," and tells commands to send reports to Air Materiel Command at Wright-Patterson AFB. It also includes a detailed checklist covering sighting details, observers, radar data and physical evidence, and the FBI Director appears on its distribution list.

From the source:Release of 2026-05-08 Incident: N/A, N/A. The FBI's 62-HQ-83894 case file includes investigative records, eyewitness testimonies, and public reports concerning Unidentified Flying Objects and flying discs documented between June 1947 and July 1968. The records include high-profile incident accounts, photographic evidence from sites like Oak Ridge, TN, and technical proposals regarding potential propulsion systems. Additional topics include convention programs, researcher accounts, and extensive media coverage from the period. This file is partially posted on FBI vault with more redactions and some pages missing. Included here is the complete case file with several newly declassified pages and only minor redactions.

Open the PDF at page 60 Original source ↗

“Headquarters”35 pages

  • p. 1 …HQ - HEADQUARTERS . Class / Case # Sub Vol. Serial # 0062 83694 1 164 ONLY 8/11/1274166 I11…
  • p. 2 RESTRICTED r DEPARTMENT OF THE AIR FORCE HEADQUARTERS UN1TED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON…
  • p. 3 …be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air…
  • p. 10 RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25…
  • p. 11 …be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air…
  • p. 18 …FORCE HEADQUARTERS UNITED STATES Am FORCE DmECTORATE OF INI'ELLIGENCE WASHINGTON 25, D. C . 15 February…
  • p. 19 …be forwarded to the Director of Intelllgence, Headquarters United States Air Force. (3) Commanding General, Air…
  • p. 26 RESTRICTED DEPARTMENT OF THE Affi FORCE HEADQUARTERS UNITED STATES AIR FORCE DlRECTORATE OF INTELLIGENCE WASHINGTON 25…
  • p. 27 …forwarded to the Director of Intelll.gence, Headquarter s Unlted States Alr Force. (3) Commandlng General…
  • p. 34 RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25…
  • p. 35 …be forwarded to the Director of Intelligence, Headquarters United States Alr For ce. (3) Commandlng General…
  • p. 42 RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25…
  • p. 43 …be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air…
  • p. 50 RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25…
  • p. 51 …be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air…
  • p. 58 RESTRICTED DEPARTMENT OF THE Affi F ORCE HEADQUARTERS UNITED STATES AIR FORCE DffiECTORATE OF INTELLIGENCE WASHINGTON…
  • p. 59 …be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air…
  • p. 66 RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INI'ELLIGENCE WASHINGTON…
  • p. 67 …be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air…
  • p. 74 RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DmECTORATE OF INTELLIGENCE WASHINGTON 25…
  • p. 75 …be forwarded to the Director of IntelHgence, Headquarters United States Air Force. (3) Commanding General, Alr…
  • p. 82 RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25…
  • p. 83 …be forwarded to the Director of Intelllgence, Headquarters United States Air Force. (3) Commanding General, Air…
  • p. 90 RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25…
  • p. 91 …be forwarded to the Director of Intelligence, Headquarters United States Alr Force. (3) Commanding General, Air…
  • p. 98 RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25…
  • p. 99 …be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air…
  • p. 106 RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25…
  • p. 107 …be forwarded to the Director of Intelligence, Headquarter s United States Air Force. (3) Commanding General…
  • p. 114 RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25…
  • p. 115 …be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air…
  • p. 122 RESTRICTED DEPARTMENT OF THE Affi FORCE HEADQUARTERS UNITED STATES AIR FORCE DmECTORATE OF INTELLIGENCE WASHINGTON 26…
  • p. 123 …forwarded to the Director of Intelll.gence, Headquarters United States Air Force. (3) Commanding General, Air…
  • p. 130 RESTRICTED DEPARTMENT OF THE Am FORCE HEADQUARTERS UNITED STATES Am FORCE DmECTORATE OF INTELLIGENCE WASHINGTON 25…
  • p. 131 …be forwarded to the Director of Intelligence , Headquarters United States Alr Force. (3) Commanding General, Air…
RESTRICfED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proxlml.ty to land. (Name city, country, etc.)
4. Number of objects.
Formation type (!.f any), sketch l.f possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local fac111ties
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time 1n sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch l.f possible)
c. Apparent construction. (Of what material or substance)
d. Sii.e.
(1) Estimated size.
(2) Sl.ze as lt appeared from observer's view. (Compared to known object)
9. Direction 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.
1 b. Length and width.
RESTRICTED - 3 -

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About this file

Official release, from the pursue collection. The PDF is mirrored here; the original link is above. 137 pages are in the text index: search them above, or from the library's search.