An exercise controller with Tactical Training Exercise Control Group briefs international military officers on breaching techniques at Range 220 aboard the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., May 2, 2018. The international officers are students at the Command and Staff College, Marine Corps University, Marine Corps Base Quantico, Va., and are set to graduate June 6, 2018. (U.S. Marine Corps photo by Lance Cpl. Preston L. Morris) - An exercise controller with Tactical Training Exercise Control Group briefs international military officers on breaching techniques at Range 220 aboard the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., May 2, 2018. The international officers are students at the Command and Staff College, Marine Corps University, Marine Corps Base Quantico, Va., and are set to graduate June 6, 2018. (U.S. Marine Corps photo by Lance Cpl. Preston L. Morris)