170817-N-AZ808-042 PACIFIC OCEAN (Aug. 17, 2017) Quartermaster 3rd Class Mariluz Lopezvega logs entries into the deck log aboard the Arleigh Burke-class guided-missile destroyer USS Halsey (DDG 97). Halsey is underway conducting a composite training unit exercise (COMPTUEX) with the Theodore Roosevelt Carrier Strike Group. COMPTUEX tests a carrier strike group’s mission-readiness and ability to perform as an integrated unit through simulated real-world scenarios. (U.S. Navy photo by Mass Communication Specialist Seaman Nicholas Burgains/Released)