A CH-53E Super Stallion helicopter lands on the flight deck of amphibious assault ship USS America during flight operations, April 18. - A CH-53E Super Stallion helicopter lands on the flight deck of amphibious assault ship USS America during flight operations, April 18.

U.S. Marine Corps Sgt. Adrian J. Willis, a computer technician with 7th Communications Battalion, pictured here aboard Marine Corps Base Camp Hansen in Okinawa, Japan, is one of the Marines that utilize 3D printing technology to expand capabilities within the unit. - U.S. Marine Corps Sgt. Adrian J. Willis, a computer technician with 7th Communications Battalion, pictured here aboard Marine Corps Base Camp Hansen in Okinawa, Japan, is one of the Marines that utilize 3D printing technology to expand capabilities within the unit. Willis, from Las Vegas, Nev., is in charge of expanding the printer’s capabilities and establishing the standard operating procedures for the printer in order to implement and track its impact in the unit. (Photo by United States Marine Corps Cpl. George Melendez)

U.S. Marine Corps Lt. Gen. David H. Berger, left, outgoing commander of U.S. Marine Corps Forces, Pacific, and Lt. Gen. Lewis A. Craparotta, incoming commander of MARFORPAC, salute the colors as they pass in review during the MARFORPAC change of command ceremony at Marine Corps Base Hawaii, Aug. 8, 2018. The change of command ceremony represents the transfer of responsibility and authority over MARFORPAC between commanders. - U.S. Marine Corps Lt. Gen. David H. Berger, left, outgoing commander of U.S. Marine Corps Forces, Pacific, and Lt. Gen. Lewis A. Craparotta, incoming commander of MARFORPAC, salute the colors as they pass in review during the MARFORPAC change of command ceremony at Marine Corps Base Hawaii, Aug. 8, 2018. The change of command ceremony represents the transfer of responsibility and authority over MARFORPAC between commanders.

Top performing Marines from throughout the Corps stand at attention after being awarded the Navy and Marine Corps Commendation Medal at the Commandant of the Marine Corps Combined Awards Ceremony May 11, 2016 at Marine Corps Base Quantico, Virginia. The ceremony recognized top performing Marine recruiters, drill instructors, combat instructors, career planners, security guards and athletes. - Top performing Marines from throughout the Corps stand at attention after being awarded the Navy and Marine Corps Commendation Medal at the Commandant of the Marine Corps Combined Awards Ceremony May 11, 2016 at Marine Corps Base Quantico, Virginia. The ceremony recognized top performing Marine recruiters, drill instructors, combat instructors, career planners, security guards and athletes.

The 37th Commandant of the Marine Corps, Gen. Robert Neller, speaks to Marines of the I Marine Expeditionary Force about the future of their Corps during his visit to Marine Corps Base Camp Pendleton, California, Oct. 5, 2015. Gen. Neller spoke about future equipment that will be used by the Marine Corps, discussed the importance of being a strong leader and answered any question the Marines had. - The 37th Commandant of the Marine Corps, Gen. Robert Neller, speaks to Marines of the I Marine Expeditionary Force about the future of their Corps during his visit to Marine Corps Base Camp Pendleton, California, Oct. 5, 2015. Gen. Neller spoke about future equipment that will be used by the Marine Corps, discussed the importance of being a strong leader and answered any question the Marines had.

Gen. Robert B. Neller speaks to Marines for the first time as commandant at Marine Corps Base Quantico, Va., Oct. 1, 2015. Neller focused on people, readiness, training, Naval integration and modernization during his speech. - Gen. Robert B. Neller speaks to Marines for the first time as commandant at Marine Corps Base Quantico, Va., Oct. 1, 2015. Neller focused on people, readiness, training, Naval integration and modernization during his speech.

Gen. Robert B. Neller, the 37th and new Commandant of the Marine Corps, speaks during his passage of command ceremony at Marine Corps Barracks Washington, D.C., Sept. 24, 2015. Gen. Dunford relinquished the position to Gen. Robert B. Neller after being confirmed to succeed U.S. Army Gen. Martin Dempsey as Chairman of the Joint Chiefs of Staff. - Gen. Robert B. Neller, the 37th and new Commandant of the Marine Corps, speaks during his passage of command ceremony at Marine Corps Barracks Washington, D.C., Sept. 24, 2015. Gen. Dunford relinquished the position to Gen. Robert B. Neller after being confirmed to succeed U.S. Army Gen. Martin Dempsey as Chairman of the Joint Chiefs of Staff.

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Members of the Joint Chiefs of staff applaud for the conclusion of the signing of the "28-star" Letter at the Pentagon, Feb. 2, 2015. The letter challenges transitioning service members to continue serving their community and encouraged greater involvement between veterans and the public. (U.S. Marine Corps photo by Lance Cpl. Remington Hall/released) - Members of the Joint Chiefs of staff applaud for the conclusion of the signing of the "32-star" Letter at the Pentagon, Feb. 2, 2015. The letter challenges transitioning service members to continue serving their community and encouraged greater involvement between veterans and the public. (U.S. Marine Corps photo by Lance Cpl. Remington Hall/released)

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General James F. Amos, left, the 35th Commandant of the Marine Corps, and Sgt. Maj. Micheal Barrett, the 17th Sergeant Major of the Marine Corps, speak to Marines and sailors with 1st Battalion, 7th Marine Regiment; 1st Battalion, 2nd Marine Regiment; and 2nd Combat Engineer Battalion aboard Camp Leatherneck, Afghanistan, Sept. 6, 2014. Gen. Amos and Sgt. Maj. Barrett visited Marines and sailors serving with Marine Expeditionary Brigade – Afghanistan in Helmand province for the final time, thanking them for their service and sacrifice. - General James F. Amos, left, the 35th Commandant of the Marine Corps, and Sgt. Maj. Micheal Barrett, the 17th Sergeant Major of the Marine Corps, speak to Marines and sailors with 1st Battalion, 7th Marine Regiment; 1st Battalion, 2nd Marine Regiment; and 2nd Combat Engineer Battalion aboard Camp Leatherneck, Afghanistan, Sept. 6, 2014. Gen. Amos and Sgt. Maj. Barrett visited Marines and sailors serving with Marine Expeditionary Brigade – Afghanistan in Helmand province for the final time, thanking them for their service and sacrifice.