the USS Princeton (CG 59) steams in formation with ships from USS Nimitz Carrier Strike Group during an exercise in the Southern California operating area Oct. 10, 2016. Thirteen warfare tactics instructors are underway with USS Nimitz Carrier Strike Group leading the Surface Warfare Advanced Tactical Training (SWATT). SWATT is a three-week exercise to tactically prepare cruisers and destroyers for carrier strike group integration. The Naval Surface and Mine Warfighting Development Center opened June 9, 2015, at Naval Base San Diego and is responsible for increasing the tactical proficiency of the Navy's surface warfare community through the creation of warfare doctrine, underway advanced-training exercises and warfare tactics instructors. (U.S. Navy Combat Camera photo by Petty Officer 1st Class Trevor Andersen/Released)