Hello everyone, I would like to recount a strange night time sighting I had a few years back. I call my experience a UFO sighting only because I could not identify what it was that I saw. At the time, I was an active duty hospital corpsmen stationed at the Naval Medical Center in San Diego, California. Me and a co-worker would take nightly smoke breaks on an outside stair well that flanked the back of the hospital. One night we were talking to each other about general stuff, when behind him in the night sky I saw the stars disappear. From left to right in the night sky, a large triangular swath of black was gliding across blocking the light of the stars. I exclaimed "look up there", as I pointed in the direction the thing was gliding. He saw the thing and said something to the effect of "Is that a bird?". I know what we saw was no bird. It was perfectly triangular, had no lights, and made not one sound. We saw it for only about 30 seconds or less. In my opinion, it was flying too low and close to down-town San Diego to be a military aircraft. Furthermore, to my knowledge the Navy does not fly stealth bombers, and there are no Air-force bases nearby. In closing, the only other thing which makes this event mentionable is the eerie feeling that I got. Something just felt strange about this whole situation. Thanks for every ones time.