170420-N-NI812-090 PACIFIC OCEAN (April 20, 2017) Sailors prepare a catapult trough for flight operations aboard the aircraft carrier USS Nimitz (CVN 68) in the Pacific Ocean. Nimitz is underway conducting a 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 Seaman Ian Kinkead/Released)