The U.S. government finally admits to the existence of UFOs. See more in this clip from "Aliens and the United States." #AncientAliens Watch all new episodes of Ancient Aliens, Friday, January 6th, at 9/8c, and next day on The HISTORY Channel website at http://history.com/schedule. Subscribe ...

Since 2007, the U.S. government has been studying unidentified aerial phenomena behind the scenes, collecting videos of possible UFO sightings. The Pentagon admits what's depicted in the videos – captured by the US military – is something they can't explain. More: ...