U.S. Marine Cpl. Anthony Bourne (right) and Lance Cpl.

U.S. Marine Cpl. Anthony Bourne (right) and Lance Cpl. Daniel Maine, riflemen with Special-Purpose Marine Air-Ground Task Force Crisis Response-Africa, demonstrate room-clearing techniques to Angolan Marines in Luanda, Angola, March 4, 2015. U.S. Marines, British Royal Marines and Spanish Marines spent three days training with the Angolans in close-quarters combat, small boat operations and repair, and visit, board, search and seizure techniques before departing for Cameroon during the maritime security exercise, Africa Partnership Station. (Official U.S. Marine Corps photo by Staff Sgt. Steve Cushman/Released)