Three U.S. Air Force F-16 Fighting Falcon aircraft fly in formation after refueling.
Three U.S. Air Force F-16 Fighting Falcon aircraft from the 64th Aggressor Squadron fly in formation after refueling during exercise Red Flag at Nellis Air Force Base, Nev., on Feb. 4, 2010. Red Flag is a realistic combat training exercise involving the U.S. Air Force and its allies. The exercise is conducted on the 15,000-square-mile Nevada Test and Training Range north of Las Vegas.