170404-N-XL056-045 PACIFIC OCEAN (April 4, 2017) Deputy Secretary of Defense Robert Work observes flight operations aboard the aircraft carrier USS Nimitz (CVN 68). 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 Leon Wong/Released)