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.

Chariots of the Gods: 50th Anniversary Edition
Chariots of the Gods: 50th Anniversary Edition
Erich Von Daniken
 Atlas of Unidentified Flying Objects
Atlas of Unidentified Flying Objects
Andy McGrillen
 Behold a Pale Horse
Behold a Pale Horse
Milton William Cooper
 American Cosmic: UFOs, Religion, Technology First Edition
American Cosmic: UFOs, Religion, Technology First Edition
D.W. Pasulka
Our recommendations from Amazon
Project SIGN – Unidentified Phenomena
unidentifiedphenomena.com

Project SIGN – Unidentified Phenomena

Project SIGN was a top-secret initiative launched by the United States Air Force (USAF) in 1947, following the widely publicized incidents of UFO sightings, suc