U.S. Marines with 5th Marine Regiment, 1st Marine Division construct tents for the Combat Operation Center during Exercise DESERT SCIMITAR aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., April 29, 2013. Exercise DESERT SCIMITAR is a combined arms exercise conducted by 1st Marine Division Marines and Sailors from all elements of the Marine Air Ground Task Force. (U.S. Marine Corps photo by Lance Cpl. Jason Morrison, 1st Marine Division Combat Camera/ Released)