U.S. Marine Corps Sgt. Maj. Frank Kammer, sergeant

U.S. Marine Corps Sgt. Maj. Frank Kammer, sergeant major of Combat Logistics Battalion 8, Combat Logistics Regiment 2, 2nd Marine Logistics Group, observes a 3D printer during Integrated Training Exercise 3-18 on Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., April 29, 2018. Additive manufacturing testing in a field environment demonstrates the capabilities and limitations of 3D printing in a tactical environment. (U.S. Marine Corps photo by Lance Cpl. Scott Jenkins)