A British Royal Marine swims with a 25 pound weight during an amphibious obstacle course 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)