U.S. Marine Corps Lance Cpl. Martin Williams fires an M-249 automatic weapon during high-angle marksmanship training in Djibouti, Sept. 15, 2012.

The training focused on the application of infantry skills in rugged mountain terrain.

The 24th Marine Expeditionary Unit is deployed with the Iwo Jima Amphibious Ready Group as a theater reserve and crisis response force throughout U.S. Central Command and the Navy's 5th Fleet area of responsibility.

U.S. Marine Corps photo by Cpl. Michael Petersheim