U.S. Navy Petty Officer 3rd Class Ryan Walker, left, runs alongside a Sri Lankan Marine performing a “fireman’s carry” on a mock patient during the tactical casualty combat care portion of a military tactics training and exchange, part of a theater security cooperation engagement at Welissara Naval Base, Sri Lanka, March 29, 2017. Walker is a hospital corpsman assigned to 1st Battalion Landing Team, 4th Marines, 11th Marine Expeditionary Unit. Marine Corps photo by Cpl. Devan K. Gowans