NELLIS AIR FORCE BASE, Nev. -- F-22 Raptors from the 90th Fighter Squadron Elmendorf Air Base, Alaska and the 49th Fighter Wing Holloman Air Force Base, N.M. fly to the Nevada Test and Training Range during Red Flag Feb. 4, 2010. Red Flag, a realistic combat training exercise involving the air forces of the United States and its allies. The exercise is conducted on the 15,000-square-mile Nevada Test and Training Range, north of Las Vegas. (U.S Air Force photo/ Staff Sgt. Taylor Worley/RELEASED)