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U.S. Marines with 3rd Assault Amphibian Battalion, 1st Marine Division, fire a MK-154 Launcher Mine Clearance on Camp Pendleton, Calif., June 23, 2017. Marine Corps Systems Command has reengineered the MK-154 with a new hydraulic and electrical system that makes the capability safer, more reliable and cheaper to maintain. (U. S. Marine Corps photo by Lance Cpl. Maritza Vela) - U.S. Marines with 3rd Assault Amphibian Battalion, 1st Marine Division, fire a MK-154 Launcher Mine Clearance on Camp Pendleton, Calif., June 23, 2017. Marine Corps Systems Command has reengineered the MK-154 with a new hydraulic and electrical system that makes the capability safer, more reliable and cheaper to maintain. (U. S. Marine Corps photo by Lance Cpl. Maritza Vela)

A Marine calibrates a three-dimensional printer during the 3-D Printing Training Course at Marine Corps Base Camp Lejeune, North Carolina. Marines have been embracing 3-D printing for several years now, and there are more than 40 units using 3-D printers in the field to build drones, buildings, vehicles and other items out of various materials. (U.S. Marine Corps photo by Sgt. Ian Leones) - A Marine calibrates a three-dimensional printer during the 3-D Printing Training Course at Marine Corps Base Camp Lejeune, North Carolina. Marines have been embracing 3-D printing for several years now, and there are more than 40 units using 3-D printers in the field to build drones, buildings, vehicles and other items out of various materials. (U.S. Marine Corps photo by Sgt. Ian Leones)