A well-known conspiracy theory (also seen in The X-Files) attests that aliens are in communication with the U.S. government, providing knowledge and advanced weaponry, or engaged in secret wars with the military.

A second batch of previously classified files on reported UFO sightings has been released by the US Department of Defence. Catch up below.

The Pentagon released its latest batch of UFO files on Friday — including audio of the Apollo 12 crew describing how they once saw mysterious “streaks of light” while trying to sleep

Well, here's something you don't see every day -- the U.S. Air Force shooting a UFO out of the sky ... at least that's how experts are interpreting this explosive new video the Dept. of War just