Petty Officer 1st Class Amiel I. Ferdluces, right, and Seaman Maurice R. Smith II, both medical corpsmen assigned to 3rd Maintenance Battalion, Combat Logistics Regiment 35, 3rd Marine Logistics Group, III Marine Expeditionary Force, take water samples from a river leading into a water point April 30. Marines then used the samples to determine how to purify and produce potable water during Exercise Balikatan 2014 in Crow Valley, Philippines. (U.S. Marine Corps photo by Lance Cpl. Joey S. Holeman, Jr./ Released)