U.S. Air Force Senior Airman Jonathan Jensen, 555th RED HORSE structures journeyman, uses a concrete Hummer Vibrator to disperse wet concrete against the wall of a K-Span building Aug. 29, 2013, at Nellis Air Force Base, Nev. RED HORSE training projects help with base construction efforts while keeping the unit’s Airmen prepared for wartime responsibilities and proficiencies. (U.S. Air Force photo by Senior Airman Daniel Hughes)
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