Photos

Gunnery Sgt. Travis Arndt, a machinist with 1st Maintenance Battalion, Combat Logistics Regiment 15, 1st Marine Logistics Group, explains the 3-D printing capabilities to Richard Spencer, the Secretary of the Navy, on Camp Pendleton, Calif., August 30, 2017. Spencer previously served as a Marine Aviator for five years flying a CH-46 Sea Knight transport helicopter. (U.S. Marine Corps photo by Lance Cpl. Adam Dublinske)