General Dynamics Electric Boat Corp., Groton, Connecticut, is awarded a not-to-exceed $19,932,000 undefinitized contract action modification to previously awarded contract N00024-20-C-2120 to support Virginia and Columbia-class efforts detailed design (Phase 3) efforts. Work will be performed in Groton, Connecticut, and is expected to be completed by September 2024. Fiscal 2022 shipbuilding and conversion (Navy) $9,966,000 funding will be obligated at the time of award and will not expire at the end of the current fiscal year. This contract was not competitively procured. The statutory authority for this sole source award is in accordance with Defense Federal Acquisition Regulation 6.302-1(a)(2)(iii) — only one responsible source and no other supplies or services will satisfy agency requirements. The Supervisor of Shipbuilding Conversion and Repair, Groton, Connecticut, is the contracting activity.