U.S. Marines with the 15th Marine Expeditionary Unit set up a bivouac spot at Arta Beach, Djibouti, Dec. 17, 2012, after a night raid exercise. The 15th MEU was deployed with the Peleliu Amphibious Ready Group as a U.S. Central Command theater reserve force supporting maritime security operations and theater security cooperation efforts in the U.S. 5th Fleet area of responsibility.