Project Grudge was a secret initiative by the United States Air Force that began in the late 1940s. Its primary goal was to investigate and analyze reports of unidentified flying objects (UFOs) and other unexplained aerial phenomena. The project aimed to determine whether these sightings posed any threat to national security. The project was part of a broader effort to understand and respond to the growing public interest in UFOs following World War II. Although Project Grudge was eventually succeeded by Project Blue Book in 1952, it played a significant role in shaping the U.S. government's approach to UFO investigations.