An F-35B Lightning II Joint Strike Fighter, Marine Fighter Attack Squadron 121, 3rd Marine Aircraft Wing, performs a conventional take-off at the Strategic Expeditionary Landing Field during Exercise Steel Knight 2016 at the Combat Center, Dec. 11, 2015. (Levi Schultz/U.S. Marine Corps)

An MV-22B Osprey, operated by a crew with Marine Medium Tiltrotor Training Squadron 204, lands during a nighttime external lifts operation at Camp Lejeune, N.C., Dec. 14, 2015. (U.S. Marine Corps)

U.S. Marines assigned to 1st Battalion, 8th Marine Regiment and 2nd Recon Battalion rappel from a CH-53E Super Stallion during helicopter rope suspension training near Marine Corps Air Station New River, N.C., Dec. 15, 2015. (Jodson Graves/U.S. Marine Corps)

A Marine holds security during a route clearance drill as a part of Exercise Steel Knight at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Dec. 13, 2015. (Eric Keenan/U.S. Marine Corps)

Friends and family welcome home a Marine with Marine Medium Tiltrotor Squadron 161 at Marine Corps Air Station Miramar, Calif. Dec. 13, 2015. (U.S. Marine Corps)

Drill Instructor Staff Sgt. Maria S. Zalwango corrects a Marine enlistee during a pool function at Weapons Field Training Battalion, Marine Corps Base Camp Pendleton, Calif., Dec. 12, 2015. (U.S. Marine Corps)

A U.S. Marine helicopter support team with Combat Logistics Battalion 1, Special Purpose Marine Air Ground Task Force???Crisis Response???Central Command, prepares to attach cargo to a U.S. Marine Corps MV-22B Osprey with Marine Medium Tiltrotor Squadron 268, SPMAGTF-CR-CC, to conduct external load qualifications for the pilots of the squadron at an undisclosed location in Southwest Asia, Dec. 13, 2015. (Owen Kimbrel/U.S. Marine Corps)

Students of Corporal's Course class 308-16 at Camp Pendleton, Calif., practice drill as part of their curriculum. The students were scheduled to graduate Friday, Dec. 18, 2015 with the hope of using their new leadership skills to mold the future of the Marine Corps. (Emmanuel Necoechea/U.S. Marine Corps)

Corporal Scott Hunt, from Palm Bay, Fla., and pointman with Company A, 1st Reconnaissance Battalion, 1st Marine Division, rests during reconnaissance and surveillance training, Nov. 19-21, 2015, at Marine Corps Training Area Bellows, Hawaii. (Tony Simmons/U.S. Marine Corps)

U.S., Romanian, and Moldovan military members participate in a tank shoot rehearsal during Platinum Lynx 16-2 at Smardan Training Area, Romania, Dec. 9, 2015. (U.S. Marine Corps)