Project Bluebook is one of the entries in the Top 5 Strangest Paranormal Military Projects.
From 1947 to 1969, the Air Force investigated Unidentified Flying Objects under Project Blue Book.
Of a total of 12, 618 sightings reported to Project Blue Book, 701 remained "unidentified."
The report concluded that there was no evidence that any of the uncategorized sightings were extraterrestrial craft.
This contradicted a 1947 report filed at the end of Blue Book's predecessor, Project Sign which was ordered to be destroyed after concluding that UFOs were likely extraterrestrial in origin.
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