Swing Study U.S. Marines and British Royal Marines commandos watch as a U.S. recruit swings on a rope during a combat endurance course at Parris Island, S.C., July 29, 2017. British personnel visited to watch how U.S. Marine recruits are trained. Marine Corps photo by Lance Cpl. Carlin Warren SHARE: Download: Full Size (3.7 MB) Credit: Lance Cpl. Carlin Warren VIRIN: 170729-M-ZW564-164C.JPG Photo Gallery