In this April 26, 2017 photo released by the U.S. Navy, the aircraft carrier USS Carl Vinson, foreground, transits the Philippine Sea with the Japan Maritime Self-Defense Force Atago-class guided-missile destroyer JS Ashigara, left front, and the JMSDF Murasame-class destroyer JS Samidare. The aircraft supercarrier is headed toward Korean Peninsula for an exercise with South Korea. (Mass Communication Specialist 2nd Class Sean M. Castellano/U.S. Navy via AP)