Documents / FOIA release
This is a United States Air Force fact sheet from the Office of Public Affairs, Secretary of the Air Force. It covers the Air Force's UFO investigations from 1948 to 1969 under Projects Sign, Grudge and Blue Book: 12,618 sightings were investigated, and 701 remain unexplained. It records that Blue Book ended on December 17, 1969, and that its conclusions found no threat to national security and no evidence of extraterrestrial vehicles. It also includes yearly sighting totals and a list of private UFO study organizations.
.,~:~~ .. . ·~ . Fact Sheet ·. ·:;~~· :r. ,.., .. ,,. . . . .....~~... · United States Air ForceSecretory ot the Air Force. Otftce ot Public Arroirs. Washington. D.C. 20330 INFORMATION OP ppos Thank you for your request for information on the Air Force's investigation of unidentified flying objects, or UFO's. The Air Force investigation of UFO's began in 1948 and was known as Project Sign. Later the name was changed t~ Project Grudge, and in 1953, it became Project Blue Book. Between 1948 and 1969 we investigated 12,618 reported sightings. Of these sightings, 11,917 were found to have been caused by material objects (such as balloons, satellites, and aircraft), immaterial objects (such as lightning, reflections, and other natural phenomena), astronomical objects (such as stars, planets, the sun, and the moon>, weather conditions, and hoaxes. As indicated, only 701 reported sightings remain unexplained. On December 17, 1969, the Secretary of the Air Force announced the termination of Project Blue Book. The decision to discontinue UFO investigations was based on an evaluation of a report prepared by the University of Colorado entitled, "Scientific Study of Unidentified Flying Objects;• a review of the University of Colorado's report by the National Academy of Sciences; past UFO studies; and the Air Force's two decades of experience investigating UFO reports. -. As a result of these investigations, studies, and experience, the conclusions of Project Blue Book were: (1) no UFO reported, investigated, and evaluated by the Air Force has ever given any indication of threat to our national security; (2) there has been no evidence submitted to or discovered by the Air Force that sightings categorized as "unidentified" represent technological developments or principles beyond the range of present day scientific knowledge; and (3) there has been no evidence indicating that sightings categorized as •unidentified• are extraterrestrial vehicles. With the termination of Project Blue Book, the Air Force regulation establishing and controlling the program for investigating and analyzing UFOs was rescinded. All documentation regarding the former Blue Book investigation was permanently transferred to the Modern Military Branch, National Archives and Record Service, 8th and Pennsylvania Avenue, Washington DC 20408, and is available for public review and analysis.
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FOIA release, from the osd collection. The PDF is mirrored here; the original link is above. 4 pages are in the text index: search them above, or from the library's search.