Staff Sgt. Steven Chalupnik, 820th RED HORSE special capabilities instructor, utilizes a rock drill to drill bore holes into a mountain during explosive demolition training at the 820th RED HORSE quarry on Nellis Air Force Base, Nev., June 9, 2015. The holes Chalupnik are drilling will be loaded with explosives and blasted, so the mountain rubble can be turned into construction material. (U.S. Air Force photo by Staff Sgt. Siuta B. Ika)
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