General Dynamics Electric Boat Corp., Groton, Connecticut, is awarded a not-to-exceed $878,000,000 undefinitized contract action modification to a previously awarded contract (N00024-17-C-2100) for additional material in support of the planned Virginia Class submarines SSN 812 and SSN 813 and in furtherance of the Navy’s commitment to the health and stability of the industrial base. Work will be performed in Chesapeake, Virginia (6%); El Cajon, California (4%); Waltham, Massachusetts (3%); Westfield, Massachusetts (2%); Depew, New York (2%); South El Monte, California (2%); Ladson, South Carolina (2%); Linden, New Jersey (2%); Philadelphia, Pennsylvania (2%); Jacksonville, Florida (2%); Manchester, New Hampshire (1%); Parsippany, New Jersey (1%); Spring Grove, Illinois (1%); Woburn, Massachusetts (1%); Sunnyvale, California (1%); and other locations less than 1% (68%), and is expected to be completed by September 2033. Fiscal 2024 shipbuilding and conversion (Navy) funds in the amount of $658,500,000 will be obligated at time of award and will not expire at the end of the current fiscal year. Naval Sea Systems Command, Washington, D.C., is the contracting activity.