In this episode of "Mysteries of UFOs," we explore Project Blue Book, the U.S. government's longest-running and most extensive investigation into UFO phenomena. Launched by the U.S. Air Force in 1952, Project Blue Book sought to evaluate the potential threat of unidentified aerial objects and determine their origins. Over 17 years, it investigated over 12,000 sightings, including famous cases like the Lubbock Lights, the Washington, D.C. UFO Flap, and the Lonnie Zamora Incident. Despite officially concluding that UFOs posed no national security risk, the project left many cases unexplained, fueling ongoing speculation and inspiring future government investigations into aerial phenomena.