NELLIS AIR FORCE BASE, Nev. -- F-22As assigned to the 525th Fighter Squadron, Elmendorf Air Force Base, Alaska, and the 49th Fighter Squadron, Holloman Air Force Base, N.M., prepare to depart Nellis Air Force Base, Nev., flightline for a training mission during Red Flag 10-2, Nev., Feb. 4, 2010. Red Flag is 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/Airman 1st Class Brett Clashman)