Marines assigned to 24th Marine Expeditionary Unit lay out 5.56mm ball ammunition in preparation for a live-fire exercise aboard USS Iwo Jima Jan. 4, 2015. The 24th MEU and Iwo Jima Amphibious Ready Group are conducting naval operations in the U.S. 6th Fleet area of operations in support of U.S. national security interests in Europe. (U.S. Marine Corps photo by Lance Cpl. Austin A. Lewis/Released)