Project Blue Book was the U.S. Air Force's 17-year investigation into UFOs. Over 12,000 cases. Their official job was to explain every single one. Meteors. Owls. Temperature inversions. But some of them defied every explanation they tried. Police officers. Military crews. Entire families. Radar, photographs, and burn marks in the desert. These are the files they wanted to close but couldn't. Full episode on the channel. #projectbluebook #ufo #ufosightings #alienencounters #darkhistory #shorts #unexplainedmysteries #bluebook 👉 Connect with us: Subscribe: https://www.youtube.com/@AmericasStrangestHistory Website: http://www.americasstrangesthistory.com/ Email us: ash@americasstrangesthistory.com © America’s Strangest History