170822-N-FP690-033 PACIFIC OCEAN (Aug. 22, 2017) Aviation Boatswain’s Mate (Fuel) 3rd Class John Summers inspects a sample of unpurified jet propulsion fuel number five (JP 5) while aboard the aircraft carrier Theodore Roosevelt (CVN 71). Theodore Roosevelt 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 3rd Class Robyn B. Melvin/Released)