160415-D-DT527-917 SOUTH CHINA SEA (April 15, 2016) Secretary of Defense (SECDEF) Ash Carter speaks to Sailors and Marines on the aircraft carrier USS John C. Stennis (CVN 74) after touring the ship with Philippine Secretary of National Defense Voltaire Gazmin (center) 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)