Marines with Headquarters Battalion, 1st Marine Division, participate in Exercise Desert Scimitar at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., May 10, 2014. The division tests and refines its capabilities by acting as the headquarters element of I Marine Expeditionary Force throughout a variety of scenarios and live-fire ranges. Large-scale exercises like Desert Scimitar leave 1st Marine Division poised to respond to different crises across the world. (U.S. Marine Corps photograph by Sgt. Timothy Lenzo/Released)