Staff Sgt. Justin Foulsham, Crew Chief; 113 AMXS, conducts pre-flight checks on an F-16 prior to exercises during Green Flag West at Nellis AFB, Nev., May 22, 2011. Green Flag West replicates irregular warfare conditions currently found in Southwest Asia. Aircrews, work closely with Air Force joint terminal attack controllers. Pilots train for a mission such as close air support, and aerial reconnaissance. (U.S. Air Force photo by Tech. Sgt. Tyrell Heaton/Released)