NELLIS AIR FORCE BASE, Nev. -- A two-ship flight formation of F-18 Hornets assigned to the Marine Attack Squadron 225, Marine Corps Air Station Miramar, Calif., fly over the Nevada Test and Training Range, Nev., July 29, 2010 during Red Flag 10-4. The Red Flag exercise is a realistic combat training exercise involving the air forces of the United States and its allies. In addition to U.S. aircraft, the Royal Saudi Air Force will fly F-15S, the Pakistan Air Force will participate in their first-ever Red Flag will fly the F-16Bs and the Republic of Singapore Air Force will fly the F-16CGs. (U.S. Air Force Photo by Airman 1st Class Brett Clashman)