The U.S. Air Force Thunderbirds fly in formation behind a KC-135 Stratotanker. The U.S. Air Force Thunderbirds fly in formation behind a KC-135 Stratotanker before an aerial refueling mission over the U.S. on July 21, 2005. The Stratotanker from Altus Air Force Base, Okla., linked up with the Thunderbirds' F-16 Fighting Falcons for a refueling mission on their way to Terre Haute, Ind. SHARE IMAGE: Download Image: Full Size (0.11 MB) Photo By: VIRIN: 538624-G-TTA32-484.jpg Photo Gallery