A Marine from the 13th Marine Expeditionary Unit, provides cover fire during a platoon assault exercise at Arta Range, Djibouti, Feb. 10, 2014. The 13th MEU is deployed with the Boxer Amphibious Ready Group as a theater reserve and crisis response force throughout the U.S. 5th Fleet area of responsibility.

Sgt. Michael Dowell, a reconnaissance Marine serving with Alpha Company, 1st Reconnaissance Battalion, sights in his .50 caliber sniper rifle during a raid exercise at Camp Pendleton, Calif., July 10, 2013. Dowell, 29, from Elko, Nev., serves as the sniper for his team as well as the pointman.

Marines with the 31st Marine Expeditionary Unit (31st MEU) Force Reconnaissance Platoon fire M4a1 carbines during a Dynamic Assault Course at the Special Operations Training Group (SOTG) at Camp Hansen. The 5-week course teaches

A U.S. Special Operations Forces member fires a 60 mm mortar during a fire fight in Kunar province, Afghanistan, March 7, 2012, after a force of Afghan National Army commandos and coalition special operations forces searched an Afghan village for weapons caches and known anti-Afghanistan forces. (DoD photo by Mass Communication Specialist 2nd Class Clayton Weis, U.S. Navy/Released)

A Marine Special Operator, or 'Critical Skills Operator' (CSO), assigned to a Marine Special Operations Team (MSOT), 1st MSOB, pictured while on patrol in Afghanistan, 2012. MSOTS are 15-Man units deployed from a Marine Special Operations Company MSOC). MSOTs carry out foreign internal defense, unconventional warfare, special reconnaissance and direct action operations. MSOTs have been operating in Afghanistan, working alongside Afghan units, including those trained by themselves.

26th Marine Expeditionary Unit Maritime Raid Force Marines fire M4 Carbine Rifles and M1911 MEUSOC .45 caliber pistols at a range in Jordan, June 9, 2013.