150117-N-IK337-129 PACIFIC OCEAN (Jan. 17, 2015) Hospital Corpsmen 2nd Class Christopher Ryals, from San Antonio, and Hospital Corpsmen 2nd Class Isiah Burns, from Philadelphia, treat a simulated injury during a mass casualty drill aboard the Nimitz-class aircraft carrier USS John C. Stennis (CVN 74). John C. Stennis is undergoing an operational training period in preparation for future deployments. (U.S. Navy Photo by Mass Communication Specialist Seaman Christopher Frost / Released)