Decades of UFO sightings: Did Pentagon find sign of alien life?

[Collection]A Pentagon agency established to study alleged alien encounters dating back decades discovered no evidence to support allegations that any of those cases were genuine sightings of extraterrestrials. The office also denied that US had or was hiding up a program to reverse-engineer alien technology. While some occurrences remain unexplained, nearly all of reports were false or had more commonplace causes.