The U.S Navy has awarded General Dynamics Electric Boat a $22.5M contract modification for the continued development of the Common Missile Compartment for the U.S. Ohio replacement submarine and the U.K.'s Successor ballistic-missile submarine. Electric Boat is a wholly owned subsidiary of General Dynamics. Electric Boat will procure and test equipment to be used in the production of the Common Missile Compartment. Initially awarded in December 2012, the five-year, $1.85B contract calls for Electric Boat to perform research and development work for the Navy's next-generation ballistic-missile submarine, which is scheduled to begin construction in 2021. The potential value of the overall contract is $2.9B. This work will engage Electric Boat's engineering and design organization, which comprises more than 4K employees.