U.S. Air Force Staff Sgt. Tilly Baity, a crew chief assigned to the 20th Aircraft Maintenance Squadron, conducts an inspection of the intake of an F-16 Fighting Falcon aircraft from the 55th Fighter Squadron at Nellis Air Force Base, Nev., during Red Flag 10-3 on Feb. 25, 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.