150302-N-GZ947-053 BREMERTON, Wash. (March 2, 2015) Sailors participate in a barricade drill on the flight deck of the 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 Kenneth Rodriguez Santiago/Released)