While on guard duty during Operation Desert Shield, I and three others we're talking at the entrance gate to our compound in the Saudi desert, all at once we stopped talking and looked up at the same time and saw a white/bluish circular object directly above us approx. 25000 ft or more, best guess, the object moved slowly over us , no sound, as it moved away it did an erratic "zig zag" pattern then moved away in a straight course in the blink of an eye. No one said a word while watching it, after it was gone we all confirmed with each other we had seen the same thing, whatever it was?1. The object was a brilliant white/blue light in the shape of a circle. 2. It moved slowly at first, as it moved futher away it did an erratic pattern of movement, the movement was like a child scribbling on paper, I describe it like this because you could see the entire outline of its movements "a light trail" behind it, all of this within a second or two. It then moved out of sight in a straight line in less than a second. The object only left a trail of light during it's erratic movement. There was four of us who witnessed this event, 3 white males, one black male, ages between 20 and 25 yrs old, all of us in the US Army.