A U.S. Marine with 1st Combat Engineer Battalion operates a 624KR Tractor Rubber-tired Articulated Steering Multipurpose vehicle to transport dirt for a terrain model of Marine Corps Air Ground Combat Center Twentynine Palms aboard Camp Pendleton, Calif., Apr. 23, 2014. The terrain model was constructed for the commanding general of 1st Marine Division, Major Gen. Lawrence D. Nicholson, for the Rehearsal of Concept Brief of Exercise Desert Scimitar. (U.S. Marine Corps photo by Lance Cpl. Brandon Martinez, 1st Marine Division Combat Camera/Released)