170817-N-IA905-0135 PACIFIC OCEAN (Aug. 17, 2017) Engineman 1st Class Blake Petenbrink moves a pallet of dry goods during a replenishment-at-sea aboard the guided-missile destroyer USS Preble (DDG 88). Preble is underway conducting a composite training unit exercise (COMPTUEX) with the Theodore Roosevelt Carrier Strike Group in preparation for an upcoming deployment. 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 Morgan K. Nall/Released)