180420-N-FN963-0005 PHILIPPINE SEA (April 20, 2018) Boatswain’s Mate 3rd Class Kelvin Tyler leads rigid-hull inflatable boat operations on the boat deck of the Arleigh Burke-class guided-missile destroyer USS Sterett (DDG 104) during a visit, board, search and seizure drill as part of a certification exercise (CERTEX). CERTEX is the final evaluation in a series of training exercises which ensures readiness for crisis response throughout the Indo-Pacific region. (U.S. Navy photo by Mass Communication Specialist 2nd Class Richard L.J. Gourley/Released)