U.S. Air Force Staff Sgt. William Hatten and Airman 1st Class Mindenhall, crew chief's, 28th Aircraft Maintenance Squadron, Ellsworth Air Force Base, S.D., unscrew a panel on a B-1B Lancer at Nellis Air Force Base, Nev., during exercise Green Flag West 11-6, April 28. 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 missions such as close air support, and aerial reconnaissance.