U.S. Air Force Senior Airman Tammon Benjamin, 820th Red Horse pavement and construction journeyman, instructs Senior Airman Antoine Davis, 823rd Red Horse equipment operator, on rock drill procedures, April 17, 2012, at Nellis Air Force Base, Nev. The rocks drill enables the crew to make holes large enough for 30 pounds of explosives. (U.S. Air Force photo by Staff Sgt. William P.Coleman/Released)
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