The approximate time was @ 5:30 PM (AZ time). I was outside talking with my new neighbor (I just moved into my new house), and about a minute into our convo, I noticed something flying above us but no noise. There were two objects flying in tandem, side-by-side. The object on the left was all black, and I could not determine the shape of it. My best guess was that it looked like loosely crumpled aluminum foil. The object on the right looked the same, but it was silver in color. As they flew over us towards the South East, the object on the right seemed to be tumbling through the air like a tumbleweed. It looked almost exactly as if a loose ball of foil was tumbling down the road due to wind...but this was in the air. This object was slightly ahead of the other, but to the right of it. Both were traveling in a straight line, about 500 feet high, and about 30-50 mph. My neighbor and I were trying to make sense of them as we watched them fly by. They came from the direction of the Air Force base, but he never saw anything like it (he is in the Air Force and works at Davis-Monthan).