U.S. Marine Lt. Gen. David A. Berger speaks to the Marines of 1st Maintenance Battalion, Combat Logistics Regiment 15, 1st Marine Logistics Group, after a demonstration on 3-D printing technology at Marine Corps Base Camp Pendleton, California, April 6, 2016. Berger is the commanding general of I Marine Expeditionary Force. The battalion demonstrated the potential of 3-D printing capabilities to the commanders of I MEF and 1st MLG. Still in the testing phase with the printers, the battalion has already discovered endless possibilities as to how they can integrate the technology into their mission. - U.S. Marine Lt. Gen. David A. Berger speaks to the Marines of 1st Maintenance Battalion, Combat Logistics Regiment 15, 1st Marine Logistics Group, after a demonstration on 3-D printing technology at Marine Corps Base Camp Pendleton, California, April 6, 2016. Berger is the commanding general of I Marine Expeditionary Force. The battalion demonstrated the potential of 3-D printing capabilities to the commanders of I MEF and 1st MLG. Still in the testing phase with the printers, the battalion has already discovered endless possibilities as to how they can integrate the technology into their mission.