Some USAF officers and men do.
http://www.foxnews.com/scitech/2010/09/23/aliens-monitoring-nukes-worry-ex-air-force-officers/
http://www.foxnews.com/scitech/2010/09/23/aliens-monitoring-nukes-worry-ex-air-force-officers/
Just becasue it is unidentified don't mean little green men are driving it.
I've seen some pretty wild stuff mid-ocean late at night and some of it I have no idea what it was but I don't for a minute think it was supernatural or extraterrestrial in origin.
As for UFO sightings my money would be on secret/experimental military stuff for a good percentage and intentional hoaxes for a good bit of it. And there are just some serious crackpots out there for the rest of it.
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