Observed 1 object moving app. 200 kts., traveling east to west, altitude app. 3000 ft.

Only 1 object, triangular in shape, two lights on each corner, moving east to west and traveling at about 200 kts. Because of the time of the observation altitude is only a rough estimate, however at the time I was an Air Traffic Controller in the U.S. Air Force, so it was my job to be able to determine such information by sight, this also means I had radar equipment at my disposal to track airborne aircraft under my control, and at the time of the observation neither myself nor the other two witnesses were able to observe a radar signature of the craft. It appeared to be about 1 mile south of our position in the control tower at Scott A.F.B.. The object made no noise whatsoever.