NELLIS AIR FORCE BASE, Nev. -- A U.S. Marine Corps pilot assigned to the Marine Attack Squadron 225, Marine Corps Air Station Miramar, Calif., analyzes the top of an F-18 on July 27, 2010 at Nellis Air Force Base, Nev., during Red Flag 10-4. Red Flag is a realistic combat training exercise involving the air forces of the United States and its allies. The exercise is hosted north of Las Vegas on the Nevada Test and Training Range. In addition to U.S. aircraft, the Royal Saudi Air Force, Pakistan Air Force and the Republic of Singapore Air Force detachment at Luke AFB, Ariz. will also be participating. (U.S. Air Force Photo by Airman 1st Class Brett Clashman)