Marines with Amphibious Assault Platoon, Company E, Battalion Landing Team 2/6, load the unit's amphibious assault vehicles aboard the USS Oak Hill (LSD-51) during the 26th Marine Expeditionary Unit's Composite Training Exercise, July 19, 2015. ()

Sgts. Stephen Wills, left, and Brandon Hendrix, drill instructors from Marine Corps Recruit Depot San Diego, motivate Jose Garcia, a Marine enlistee from Yakima, Wash., during a Recruiting Station Seattle pool function at the Yakima Training Center in Yakima, July 17, 2015. (Reece Lodder/U.S. Marine Corps)

U.S. Navy SEALs board a ship from a Rigid-Hull Inflatable Boat as they conduct a joint Visit, Board, Search, and Seizure exercise alongside U.S. Marines assigned to Force Reconnaissance Platoon, Maritime Raid Force, 26th Marine Expeditionary Unit, during composite training unit exercise in the Atlantic Ocean, July 20, 2015. (Andre Dakis/U.S. Marine Corps)

Cpl. Christopher Fuller, a crew chief with Marine Aerial Refueler Transport Squadron 252, embraces his wife, Jessica Fuller, during a return celebration for the Marines of VMGR-252 at Marine Corps Air Station Cherry Point, N.C., July 20, 2015. (Jason Jimenez/U.S. Marine Corps)

Marines from the National Capitol Region salute during the playing of the National Anthem, July 21, 2015, at Nationals Park in Washington. The Washington Nationals hosted a Marine Corps Day to honor Marines who serve and who have served in the past. (Terry Brady/U.S. Marine Corps)

Veterans with the Marine Corps League of Woodstock, Ga., stand and salute the colors as they pass by during Lance Cpl. Squire Wells' memorial at Sprayberry High School in Marietta, Ga., July 21, 2015. Wells is one of five servicemembers to be killed when a gunman entered the Naval Operational Support Center and Marine Corps Reserve Center in Chattanooga, Tenn. on July 16, 2015. (Marine Corps photo)

Recruits of Company B, 1st Recruit Training Battalion, swim 25 meters during basic water survival training July 20, 2015, on Parris Island, S.C. ()

CH-53E avionics technicians with the Marine Medium Tiltrotor Squadron 162, 26th Marine Expeditionary Unit, conduct preventive maintenance on a CH-53E Super Stallion aboard the USS Arlington in the Atlantic Ocean, July 21, 2015. ()

An MV-22B Osprey assigned to Marine Medium Tiltrotor Squadron 162, 26th Marine Expeditionary Unit, takes off from the flight deck of the USS Arlington in the Atlantic Ocean, July 21, 2015. (Jeraco Jenkins/U.S. Marine Corps)

An Amphibious Assault Vehicle attached to 1st Battalion, 3rd Marine Regiment, launches an M58 Mine Clearing Line Charge during a live-fire training exercise aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., July 21, 2015. (Owen Kimbrel/U.S. Marine Corps)