Former intelligence official David Grusch testified under oath to Congress that the US government possesses non-human craft and biologics in a secret retrieval program.
The Air Force allegedly filmed a UFO landing at Holloman AFB and offered the footage for a documentary before withdrawing it at the last moment.
A controlled fireball landed near Kecksburg, PA; witnesses described an acorn-shaped craft with hieroglyphics before the Army removed it under secrecy.
Captain Thomas Mantell died pursuing a large metallic UFO over Kentucky, becoming the first pilot death attributed to a UFO chase.
Private pilot Kenneth Arnold's sighting of nine unusual objects near Mount Rainier launched the modern UFO era and coined the term 'flying saucers.'
Over 800 UFO sightings in just two weeks during the summer of 1947 created a nationwide phenomenon that launched government investigations and permanently changed American culture.