I believe in UFO's in that they're unidentified flying objects. It's no dream that our government is at least 20 years ahead of "current" technology. To me, there's nothing mystical about it. Our government needs to be on the cutting edge of aircraft and have it be entirely secret. Of course it's going to look alien to us. Look at the F-117 and the B2 Spirit- those are quite "alien" looking craft.

As far as any craft being piloted by anything other than humans, I'm not a believer.