150407-N-GZ947-023 PACIFIC OCEAN (April 7, 2015) Machinist's Mate 3rd Class Matthew Lohr, from Two Rivers, Wis., calibrates a pressure gauge aboard aircraft carrier USS John C. Stennis (CVN 74). John C. Stennis is undergoing a tailored ship's training availability and final evolution problem, assessing its abilities to conduct combat missions, support functions and survive complex casualty control situations. (U.S. Navy Photo by Mass Communication Specialist Seaman Kenneth Rodriguez Santiago/Released)