170324-N-DA275-041 PACIFIC OCEAN (March 24, 2017) The aircraft carrier USS Nimitz (CVN 68) receives fuel during an underway replenishment-at-sea (UNREP) with the Fleet Replenishment Oiler USNS Yukon (T-AO 202), middle, while conducting a vertical replenishment-at-sea (VERTREP) with the Dry Cargo and Ammunition Ship USNS Carl Brashear (T-AKE 7). Nimitz is underway conducting Composite Training Unit Exercise (COMPTUEX) with the Nimitz 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 3rd Class Samuel Bacon/Released)