U.S. Air Force airborne jumpers perform buddy checks on each other. U.S. Air Force airborne jumpers with the 820th Rapid Engineer Deployable Heavy Operational Repair Squadron Engineers perform buddy checks on each other before departing for a mission in support of exercise Red Flag 11-2 over the Nevada Test and Training Range at Nellis Air Force Base, Nev., on Feb. 4, 2011. Red Flag is a realistic combat training exercise involving the air forces of the United States and its allies. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 041878-J-FYO04-759.jpg Photo Gallery