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Tech. Sgt. Mark Ondersma, 386th Expeditionary Civil Engineer Squadron, heavy equipment operator, operates a Volvo vibratory roller here, July 24, 2013. Ondersma compacts the gatch to level it in preparation for a building at that location. Gatch is a sand and gypsum mix used under all buildings here; it is the equivalent to quick concrete. Ondersma, a native of Hudsonville, Mich. is deployed out of the 110th Airlift Wing, Battle Creek, Mich., Air National Guard unit. (U.S. Air Force photo by Master Sgt. Christopher A. Campbell)
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