Project SIGN: The USAF’s Early UFO Research at Wright-Patterson and the 1948 Estimate of the Situation
To the point
Project SIGN was a secret 1947 USAF study at Wright-Patterson AFB to collect UFO reports, interview witnesses, and decide whether sightings were extraterrestrial, foreign, or natural, best known for the top-secret 1948 "Estimate of the Situation" and cited by Michael Swords and Leslie Kean, laying the groundwork for later programs like GRUDGE and BLUE BOOK.
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