BACK FLIP U.S. Air Force Tech. Sgt. Derrick Brooks back flips from an Oregon Army National Guard CH-47 Chinook helicopter at 7,200 feet during a jump demonstration in Pendleton, Ore., April 23, 2009. Brooks is a pararescue jumper assigned to the 304th Rescue Squadron, Air Force Reserve. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 759133-U-LMO36-017.jpg Photo Gallery