Project Blue Book was the third and most extensive of a series of systematic studies conducted by the U.S. Air Force on unidentified flying objects. Preceded by Project Sign in 1947 and Project Grudge in 1949, Project Blue Book was initiated amid a surge of public interest and concern over UFO sightings. Headquartered at Wright-Patterson…
Project Sign, initiated by the U.S. Air Force in 1948, was the first official government program tasked with investigating unidentified flying objects (UFOs). It marked the beginning of the U.S. military’s long-standing interest in the UFO phenomenon, laying the groundwork for future projects like Project Grudge and Project Blue Book. Initially, Project Sign took the…