U.S. Marine Lance Cpl. Andrew Sprouse, left, a combat

U.S. Marine Lance Cpl. Andrew Sprouse, left, a combat engineer with 9th Engineer Support Battalion, 3rd Marine Logistics Group, III Marine Expeditionary Force, introduces himself to Philippine Navy Seaman Apprentices Raymond Baclason, center, and Arturo Arandela, both Seabees with the Armed Forces of the Philippines’ 2nd Naval Mobile Construction Battalion, at the site of a new classroom they are helping build at San Rafael Elementary School in San Rafael, on the island of Palawan, Philippines, April 16. The three are part of a larger group of service members from the AFP and U.S. militaries, constructing five new buildings across the island of Palawan as part of humanitarian civic assistance projects taking place during exercise Balikatan 2015. Balikatan, a Filipino word meaning "shoulder-to-shoulder," is an annual bilateral exercise with the AFP and U.S. militaries, which helps increase combined military-to-military training and build relationships in order to support future engagements. (U.S. Marine Corps photo by Staff Sgt. Cristina Porras)