Project Grudge
U.S. Air Force investigation of UFOs (1949-51) / From Wikipedia, the free encyclopedia
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Project Grudge was a short-lived project by the U.S. Air Force (USAF) to investigate unidentified flying objects (UFOs). Grudge succeeded Project Sign in February, 1949, and was then followed by Project Blue Book. The project formally ended in December 1949, but continued in a minimal capacity until late 1999.