U. S. Marine Corps Sergeant Major David Jobe, sergeant major of 1st Marine Division, sits aboard a CH-53 helicopter while conducting a battlefield circulation aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif. during Exercise STEEL KNIGHT 14, December 13, 2013. STEEL KNIGHT enables 1st Marine Division to test and refine its command and control capabilities by acting as the headquarters element for a forward-deployed Marine Expeditionary Force. (U. S. Marine Corps photo by CWO3 Benn Barr, 1st Marine Division Combat Camera/Released)