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Signed by Major General C.P. Cabell as USAF Director of Intelligence in February 1949, this memorandum formally institutionalized multi-agency UAP reporting infrastructure including Geiger counter checks and soil sample collection, distributed to the FBI, CIA, Naval Intelligence, and Coast Guard, representing one of the earliest known formal inter-agency UAP collection directives.
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Official Conclusion
Procedural memorandum establishing collection requirements; no incident conclusion applicable.
Official Description
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.
Key Findings
This document is Air Intelligence Requirements Memorandum Number 4, dated 15 February 1949, issued by the Directorate of Intelligence, Headquarters United States Air Force. It establishes formal Air Force requirements and standardized reporting procedures for sightings of unconventional aircraft and unidentified flying objects, including 'Flying Discs.' The document supersedes earlier Army collection memoranda and distributes reporting protocols to all major Air Commands, Air Attaches, and non-Air Force agencies including the FBI, CIA, and naval intelligence. The file contains approximately 15-16 identical copies of the same 7-page memorandum, filed as FBI case 62-HQ-83894, Serial 164.
Analyst Notes
This document contains no incident-specific UAP content; it is a procedural memorandum establishing reporting requirements. The file consists of approximately 15-16 near-identical copies of the same 7-page memo, which is administratively redundant. The memorandum describes what information to collect but does not itself constitute evidence of any UAP incident.
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AI analysis by claude-sonnet-4-6 · May 20, 2026
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