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About Naval Sea Systems Command (Wikipedia Record):

The Naval Sea Systems Command (NAVSEA) is the largest of the United States Navy's five "systems commands," or materiel organizations. From a physical perspective, NAVSEA has four shipyards for shipbuilding, conversion, and repair, ten "warfare centers", the NAVSEA headquarters, located at the Washington Navy Yard, in Washington D.C., and other locations in 15 states and 3 overseas continents.