U.S. Air Force F-16 Aggressor aircraft from the 18th Aggressor Squadron fly a sortie over Alaska June 24, 2010, during exercise Red Flag - Alaska 10-3. Red Flag Alaska is a Pacific Air Forces-directed advanced aerial exercise that trains U.S. and allied air force pilots for real combat situations. (DoD photo by Tech. Sgt. James Harper Jr., U.S. Air Force/Released)