160927-N-QY316-325 PACIFIC OCEAN (Sep. 27, 2016) A MK 38 – 25mm machine gun system fires off the starboard side of the guided-missile destroyer USS Chafee (DDG 90) during a Surface Warfare Advanced Tactical Training (SWATT) weapons exercise in the Southern California operating area. SWATT is a three-week exercise designed to tactically prepare cruisers and destroyers for carrier strike group integration. (U.S. Navy photo by Petty Officer3rd Class William J. Blees/Released)