180119-M-WQ703-002 MARINE CORPS BASE CAMP PENDLETON, Calif. (Jan. 19, 2018) A U. S. Navy sailor with Assault Craft Unit 5, secures chains onto an Expeditionary Fire Support System vehicle on a Landing Craft Air Cushion (LCAC) as part of Iron Fist 2018. Iron Fist is a five-week-long exercise focusing on advanced marksmanship, amphibious reconnaissance, fire and maneuver assaults, staff planning, logistical support, medical knowledge sharing, fire support operations, including mortars, artillery and close air support, and amphibious landing operations. (U.S. Marine Corps photo by Gunnery Sgt. Robert B. Brown Jr./ Released)