The Pentagon released 3 videos taken in 2004 depicting unidentified flying objects.  The videos, which were actually released first by a private company in 2017, were taken in 2004 by a F/A-18 pilot.

The videos depict an object that moves in ways in which the pilot thought were near impossible.  Senator Harry Reid even chimed in on twitter to commend The Pentagon for releasing the footage.

I'm not one to comment one way or another about these videos and I'll leave the speculation to others.  Wired.com did put together a pretty in depth article on the videos, if you did want to hear a little bit more about possible conspiracy theories.