Senior Airman Neal Larson, 28th Aircraft Maintenance Squadron B-1 bomber crew chief, marshals a B-1 on the flightline prior to takeoff at Ellsworth Air Force Base, S.D., Sept. 10, 2013. In addition to other maintenance tasks, crew chiefs perform inspections, launch, recover and refuel aircraft. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)