Project Blue Book, a 1952 US Air Force program to investigate UFO sightings during the Cold War, systematically collected eyewitness accounts, physical evidence, and radar data, used a plausibility classification to explain incidents, att… #aliens #apr2026 #ovni #uap #ufo #ufosky #usa #weeklyspooky https://www.weeklyspooky.com/blog/project-blue-book-declassified