General Dynamics Mission Systems has received a contract to upgrade and sustain fire control systems and subsystems on the nuclear-powered ballistic-missile submarines (SSBN) operated by the US Navy and the British Royal Navy.

The omnibus contract is a follow-on to a previous contract received by the company in December 2015.

The scope of the initial contract included the development, production, installation, and support of weapons systems and components onboard British and American Trident II submarines.

Under the potential $299.86m four-year contract, General Dynamics Mission Systems will continue to support the systems.

The company will modernise the strategic weapon system of the SSBN. Work will include installation, maintenance, and sustainment of fire control subsystem and providing repairs to subsystems relating to launch and navigation.

In addition, the contract will allow the General Dynamics business unit to continue working on the development of the fire control system for the Royal Navy’s Dreadnought-class submarine and the US Navy’s Columbia-class submarine.

The contract also includes the development and maintenance of the attack weapon control system of the US Navy’s Ohio-class guided-missile submarine.

General Dynamics Mission Systems Maritime & Strategic Systems business vice-president and general manager Carlo Zaffanella said: “Our support for the navy’s strategic deterrent programme spans nearly six decades, and forms the foundation of our US Navy business.

“Continuing the work we have done on existing Ohio SSBN fire control systems, and the development of the fire control system for the navy’s newest fleet of submarines demonstrates our ongoing relationship, built on trust, partnership and innovation, with the US and UK naval forces.”

The majority of the contract work will be performed in Pittsfield, Massachusetts, with completion set to take place by 30 December 2024.