U.S. Air Force Academy graduates throw their hats in the air as the Thunderbirds fly overhead signaling the end of the Air Force Academy graduation ceremony, Colorado Springs, Colo., May 30, 2007. U.S. Air Force Academy graduates throw their hats in the air as the Thunderbirds fly overhead signaling the end of the Air Force Academy graduation ceremony, Colorado Springs, Colo., May 30, 2007. SHARE: Download: Full Size (1.41 MB) Tags: Photo Essays Credit: VIRIN: 135170-K-GXF45-399.jpg Photo Gallery