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.
“National Academy of Sciences”2 pages
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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.