160415-D-DT527-932 SOUTH CHINA SEA (April 15, 2016) A U.S. Navy Sailor listens as Secretary of Defense (SECDEF) Ash Carter speaks on the aircraft carrier USS John C. Stennis (CVN 74) after touring the ship with Philippine Secretary of National Defense Voltaire Gazmin as it sails the South China Sea April 15, 2016. Carter is visiting the Philippines to solidify the rebalance to the Asia-Pacific region. (U.S. Air Force photo by Senior Master Sgt. Adrian Cadiz/Released)