180914-N-WM647-1670 PHILIPPINE SEA (Sept. 14, 2018) The Nimitz-class aircraft carrier USS Ronald Reagan (CVN 76) transits the Philippine Sea during Valiant Shield 2018. Valiant shield is a U.S. only, biennial field training exercise (FTX) with a focus on integration of joint training in a blue–water environment among U.S. forces. This training enables real-world proficiency in sustaining joint forces through detecting, locating, tracking, and engaging units at sea, in the air, on land, and in cyberspace in response to a range of mission areas. (U.S. Navy photo by Mass Communication Specialist 2nd Class Elesia Patten/Released)