General Dynamics Electric Boat
A contract modification for , "Montana" (SSN-794), and was initially awarded to General Dynamics Electric Boat for $594.7 million in April 2012. On 23 December 2014, they were awarded an additional $121.8 million contract modification to buy long lead-time material for the three "Virginia"-class submarines. The U.S. Navy awarded General Dynamics Electric Boat the contract to construct 10 Block IV "Virginia"-class submarines for $17.6 billion on 28 April 2014. The tenth boat is scheduled for delivery in 2023.