Cloaked spacecraft? Something hidden in a cloud?I went outside on the deck to have a cigarette like I normally do at night. I'm always looking into the sky in hopes of seeing a meteor which is quite common, sometimes several each night. This night was different.Out of the corner of my right eye (north) I'm facing west, I see a blur. I will do my best to describe it...it was circular in shape, very large and very high, no noise, and moved incredibly fast in a straight line. The only thing I can think of is it had a type of cloaking device b/c basically, it looked like a very fast moving circular cloud. I tried to discount it as a comet, couldn't be-no tail, cloud remained in perfect shape as it sped from the north to the south across the sky and what looked like into space. I believe it WAS in our atmosphere and than moved into space out of sight. I've never seen anything move so fast in my life...and I was Air Force. No lights, crossed the horizon and into space in less than 3-4 seconds.((NUFORC Note: Source of report indicates that the date of the incident is approximate. PD))