General Dynamics Electric Boat Corp., Groton, Connecticut, is awarded a not-to-exceed $71,425,061 undefinitized contract action modification to previously awarded contract N00024-20-C-2120 for lead yard support and development studies and design efforts related to Virginia Class submarines. Work will be performed in the continental U.S. and is expected to be completed by December 2025. Fiscal 2024 research, development, test and evaluation (Navy) funding in the amount of $14,499,950 will be obligated at time of award and will not expire at the end of the current fiscal year. 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. Naval Sea Systems Command, Washington, D.C., is the contracting activity.