Members of the British Royal Marines maneuver through an obstacle course with a ammo cans and rubber rifles on Del Valle Field aboard Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Oct. 7, 2014. U.S. Marines, Dutch Marines, and Royal Marines were competing in the Combat Center's High Intensity Tactical Training Black Alligator Challenge. (Official U.S. Marine Corps photo by Staff Sgt. Leon M. Branchaud/Released)