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Project Sign: Unidentified Aerial Objects, Technical Report F-TR-2274-IA (1949)

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United States Air Force, Air Materiel Command. A report written by US Air Force officers as part of their duties, so it is a work of the US Government and in the public domain in the United States (17 USC 105). Declassified; the cover is marked Unclassified.

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RecordProject Blue BookBetween 1947 and 1969 the US Air Force logged 12,618 UFO reports. When it closed the files, 701 still carried the label unidentified. Even its own scientific consultant later mocked it as a society for explaining the uninvestigated. What did the Air Force conclude, and what do the unexplained cases actually mean?

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