A flight of F-15 Eagles and F-16 Fighting Falcons Aggressors fly in formation over the Nevada Test and Training Ranges June 5, 2008. The proposal for Red Flag came in early 1975 as an exercise that would pit student "Blue Forces" against dedicated aggressor piloted "Red Forces" in a series of combat scenarios over the vast range north of Las Vegas. (U.S. Air Force photo by Master Sgt. Kevin J. Gruenwald)