Airman 1st Class Steven Singleton, 28th Operation Support Squadron airfield management specialist, picks up a rock during a foreign object and debris check on the active runway on Ellsworth Air Force Base, S.D., April 4, 2013. Priced at more than $3,700,000 each, a B-1 bomber’s engines and a variety of other vital parts – flight controls, ejection seats and cockpit controls – can easily become inoperative if a foreign object finds its way into the wrong place. (U.S. Air Force photo by Airman 1st Class Kate Thornton-Maurer/Released)