Airman 1st Class David Heller, 28th Munitions Squadron equipment support technician, inventories parts at the equipment maintenance shop on Ellsworth Air Force Base, S.D., Aug. 20, 2013. Heller conducts a monthly inventory of equipment to ensure an adequate supply of items is available to service, maintain and repair support and munitions trailers. (U.S. Air Force photo by Airman 1st Class Rebecca Imwalle)