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This file is a collection of U.S. Government memoranda and correspondence relating to “Project Sign,” a 1948 U.S. Air Force program to investigate reports of h…

This 85-page compilation, released by the U.S. Department of War as part of its UAP records release, documents the work of the USAF Scientific Advisory Board's…

According to the releasing agency, this file is a collection of U.S. Government memoranda and correspondence concerning 'Project Sign,' a 1948 U.S. Air Force p…

This file contains an initial report from the Air Materiel Command regarding Project Sign. Project Sign was a 1948-1949 U.S. Air Force program to investigate t…

This file, released by the U.S. Department of War, contains a U.S. Air Force Air Intelligence Division study titled 'Analysis of Flying Object Incidents in the…

According to the releasing agency (U.S. Department of War), this file is a thumbnail associated with a USAF Air Intelligence Division study titled 'Analysis of…

This file is a declassified transcript, transmitted under a 22 March 1949 U.S. Atomic Energy Commission letter (Santa Fe Directed Operations), of a Secret conf…

This 67-page document is a USAF Air Intelligence Division analysis, 'Analysis of Flying Object Incidents in the United States,' Study No. 203, dated 10 Decembe…

This 116-page compilation, released by the U.S. Department of War, gathers correspondence and investigative documentation from the Armed Forces Special Weapons…

According to the releasing agencies, this is a 1971 Australian Department of Defence intelligence and scientific review of the United States Air Force Project…

According to the U.S. Department of War release, this file contains memorandums, correspondence, and forms related to the reporting of information on flying di…

According to the releasing agency, this file is an initial progress report produced by the Air Materiel Command concerning Project Sign, a 1948–1949 U.S. Air F…

This 178-page file, released by the U.S. Department of War (via war.gov) in release 3 of its UFO document collection, compiles unidentified flying object incid…

This file is part of a U.S. Department of War UFO records release (war.gov) and consists of consecutively numbered incident summaries (173–233) built around a…

According to the releasing agency (U.S. Department of War / Air Force Directorate of Intelligence), this declassified Top Secret file compiles USAFE intelligen…

Includes a "Check-List - Unidentified Flying Objects" that contains details about the incident. Many summaries also include witness lists or statements and oth…

This 214-page PDF is Section 4 of the FBI's central-records UFO case file 62-HQ-83894 (serials 131–185), part of a larger file the releasing agency describes a…

According to the releasing agency (U.S. Department of War), this file primarily contains incident reports on Unidentified Flying Objects written in compliance…