Tech. Sgt. Keith Varden (far right) and Senior Airman Jeremy Devlin, 158th Fighter Wing crew chiefs, and Maj. Nathan Graber, 158th FW pilot, prepare to launch an F-16 Fighting Falcon at Langley Air Force Base, Va. Aug. 1, 2011. This was part of an ‘alert’ exercise in which the 158th FW Airmen, an Air National Guard unit based out of Vermont, immediately scramble aircraft to support homeland defense. (U.S. Air Force photo by Staff Sgt. Logan Tuttle/Released)