Why is the U.S government hiding evidence of alien life
You must be thinking of the Roswell incident, in which an unidentified craft crashed near the small town of Roswell, New Mexico, USA, in l947. Conspiracy theorists claim the craft was a flying saucer and that the US. military whisked away the wreckage along with the bodies of its alien pilots.
The US. government released a report on Roswell in the mid-l990s claiming the debris was actually a crashed balloon in its top-secret Project Mogul, which used . A high-altitude sensors to monitor forenemy nuclear-missile tests. Likely story, claim the conspiracy theorists.