U.S. Marines assigned to the 31st Marine Expeditionary Unit maneuver an assault amphibious vehicle toward the USS Ashland from the shore of Thailand, on Feb. 21, 2016. (Darien Bjorndal/U.S. Marine Corps)

U.S. Marines with the 2nd Tank Battalion, along with the 3rd Battalion, 6th Marine Regiment, conducted a raid on a combat town at Camp Lejeune, N.C., Feb. 21, 2016. (Shannon Kroening/U.S. Marine Corps)

Sgt. Darryl Veal, drill instructor, conducts close-order drill at the 3rd Battalion parade deck at Marine Corps Recruit Depot Parris Island, S.C., on Feb. 24, 2016. (Richard Currier/U.S. Marine Corps)

U.S. Marines with 2nd Marine Division, conduct a platoon assault drill on a range at Frigard, Norway, on Feb. 22, 2016. (Rebecca Floto/U.S. Marine Corps)

Candidates assigned to Company D, Officer Candidates Class-221, are evaluated as members of a fire team during the Small Unit Leadership Evaluation 1 at Brown Field, Marine Corps Base Quantico, Va., on Feb. 22, 2016. (Patrick Owens/U.S. Marine Corps)

U.S. Marine Cpl. Charles Roy III, an optics technician assigned to the Combined Arms Company out of Bulgaria, uses small burners to melt snow into water as his unit sets up camp for the night, on Feb. 22, 2016. (Chad McMeen/U.S. Marine Corps)

Sgt. Maj. Richard Charron, sergeant major of Marine Corps Air Station Miramar, Calif., goes on his final flight in a CH-53E Super Stallion with Marine Heavy Helicopter Squadron 361, on Feb. 22, 2016. Charron will retire March 2 after 30 years of service. (Alissa Schuning/U.S. Marine Corps)

Hunter J. Woodard, a Marine recruit with Platoon 2026, Company E, 2nd Recruit Training Battalion, swims 25 meters during basic water survival training Feb. 22, 2016, on Parris Island, S.C. (Jennifer Schubert/U.S. Marine Corps)

A U.S. Marine Corps AH-1W Super Cobra helicopter kicks up snow at Vaernes, Norway, Feb. 22, 2016, as 2nd Marine Expeditionary Brigade prepares for Exercise Cold Response. (Dalton Precht/U.S. Marine Corps)

U.S. Marines assigned to Marine Medium Tiltrotor Squadron 264, 22nd Marine Expeditionary Unit, clear a mini-gun after conducting an aerial gunnery training exercise at Marine Corps Base Quantico, Va., Feb. 20, 2016. (Koby Saunders/U.S. Marine Corps)