Operation Enduring Freedom
Senior Airman Alex Pappas, a crew chief assigned to the 37th Aircraft Maintenance Unit, performs maintenance on a B-1B Lancer Jan. 24, 2010, in Southwest Asia. Each 37th AMU Airman works 72 hours a week to ensure aircraft are ready to fly. (U.S. Air Force photo/Staff Sgt. Manuel J. Martinez/Released)