U.S. Marines with Echo Company, 2nd Battalion, 4th Marines, 5th Marine Regiment take cover after launching a 60mm mortar from a M224 Lightweight Mortar Cannon during Exercise Desert Scimitar 2014 aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., May 13, 2014. Desert Scimitar 2014 enables 1st Marine Division to test and refine its command control capabilities by acting as the headquarters element for a forward-deployed Marine Expeditionary Force. Simultaneously, it offers participating units the opportunity to hone their conventional war fighting skills.(U.S. Marine Corps photo by Sgt. Luis A. Vega 1st Marine Division Combat Camera/Released)