General Dynamics unit awarded $20M U.S. Navy contract modification The U.S. Navy has awarded General Dynamics Electric Boat a $20M contract modification for nuclear-maintenance work for submarines homeported at the Naval Submarine Base in Groton. Under the contract, Electric Boat will continue to operate the Nuclear Regional Maintenance Department at the submarine base. The company will provide project management, planning, training and nuclear services to support maintenance, modernization and repairs. The company has been awarded two initial contract modifications to date, valued at $25M. The contract has a total potential value of $164M over five years.