Staff Sgt. Gordon Williamson, 28th Civil Engineer Squadron heavy equipment technician, guides Christy Wolfe, 28th CES material controls supply technician, while loading parts at the Material Controls warehouse on Ellsworth Air Force Base, S.D., May 8, 2013. The parts are for street sweepers that heavy equipment technicians use throughout the year to help keep Ellsworth streets clean and free of safety hazards. (U.S. Air Force photo by Senior Airman Kate Maurer/Released)