190411-N-RH019-0011 PACIFIC OCEAN (April 11, 2019) Sailors aboard the guided-missile destroyer USS Momsen (DDG 92) conduct maintenance and training on the Mark 15 Phalanx close-in weapons system. Momsen is conducting routine operations in the eastern Pacific. (U.S. Navy photo by Mass Communication Specialist 2nd Class Sean Rinner/Released)