A U.S. Marine Corps MV-22 Osprey approaches the flight deck for a landing while being guided by a member of the flight crew. Marines with Marine Medium Tilt Rotor Squadron 166 Reinforced, the air-combat element of the 13th Marine Expeditionary Unit, work to land and stow aircraft in preparation for the Composite Training Unit Exercise, Oct. 19, 2015. (Briauna Birl/U.S. Marine Corps)

Pfc. Anthony Muratore, scout sniper screener candidate from 3rd Battalion, 6th Marine Regiment, conducts a max set of push-ups after completing a 1.5 mile ruck run at Camp Lejeune, N.C., Oct. 20, 2015. ()

A U.S. Marine with Company F, 1st Platoon, Battalion Landing Team 2/6, 26th Marine Expeditionary Unit, prepares to attack a simulated defensive position during a live-fire exercise at Pinheiro Da Cruz, Portugal, Oct. 21, 2015. (Jeraco Jenkins/U.S. Marine Corps)

U.S. Marines with II Marine Expeditionary Force, salute during the II MEF change of command ceremony at Camp Lejeune, N.C., Oct. 22, 2015. (Chloe Nelson/U.S. Marine Corps)

Drill Instructor Sgt. Leon Booker, Platoon 3000, Company I, 3rd Recruit Training Battalion, encourages his recruits to push themselves through an incentive training session Oct. 20, 2015, at Parris Island, S.C. (Aaron Bolser/U.S. Marine Corps)

U.S. and Portuguese Marines from the Kearsarge Amphibious Ready Group, offload from an Landing Craft Air Cushion on Pinheiro Da Cruz beach while participating in a combined amphibious assault exercise as part of Trident Juncture 15, Oct. 20, 2015. (Jeraco Jenkins/U.S. Marine Corps)

Sgt. Joshua Sorensen, motor transport operator, 3rd Battalion, 7th Marine Regiment, and his wife Susan, embrace their son, Gunner, 9 months, during the battalion's homecoming at Del Valle Field, Oct. 19, 2015. (Levi Schultz/U.S. Marine Corps)

A U.S. Marine with 2nd Reconnaissance Battalion, rappels out the back of a CH-53E Super Stallion assigned to Marine Heavy Helicopter Squadron (HMH) 366, during rappelling training above Marine Corps Base Camp Lejeune, N.C., Oct. 20, 2015. (Austin Lewis/U.S. Marine Corps)

U.S. Marines with Special-Purpose Marine Air-Ground Task Force Crisis Response-Africa and Spanish Navy test rapid launch of three U.S. MV-22B Ospreys and two Spanish Harrier aircraft aboard the Spanish amphibious assault ship Juan Carlos I, Oct. 21, 2015. ()

U.S. Marines assigned to Marine Light Attack Helicopter Squadron 167 and the Expeditionary Operations Training Group conduct fast-rope training at Marine Corps Base Camp Lejeune, N.C., Oct. 21, 2015. (Jodson Graves/U.S. Marine Corps)