151112-N-KM939-038 PACIFIC OCEAN (Nov. 12, 2015) The sun sets behind the forward 54-caliber MK 45 lightweight 5-inch gun aboard the guided-missile destroyer USS Stockdale (DDG 106). Sailors from the John C. Stennis Strike Group are participating in a sustainment training exercise (SUSTEX) to prepare for future deployments. (U.S. Navy photo by Mass Communication Specialist 3rd Class David A. Cox/Released)