The package builds on an earlier agreement initially valued at $50 million and marks a transition to a more advanced phase of the programme. It supports the trilateral AUKUS partnership between the United States, the United Kingdom and Australia.
The approved support includes technical assistance for AUKUS-specific vertical deployment tubes and common weapon launchers. It also covers key elements of a federated submarine combat system architecture, alongside simulation equipment, testing and installation tools, and software.
Additional elements include engineering, logistics and programme support services, as well as information technology systems and technical documentation. The package also provides for personnel training and the deployment of embedded U.S. and UK personnel across facilities in both countries.
This personnel integration is intended to support submarine design and systems integration activities directly. Officials said it reflects the level of industrial and operational cooperation envisaged under the AUKUS framework.
The U.S. government said the proposed sale supports its foreign policy and national security objectives. It added that the programme strengthens a NATO ally and contributes to political stability and economic progress in Europe.
According to the State Department, the support will enhance the UK’s ability to meet current and future threats. It is intended to provide an effective undersea deterrent to protect maritime interests and critical infrastructure.
The programme is also expected to contribute to maritime security in northwestern Europe. Officials said it supports broader NATO and U.S. strategic objectives without altering the regional military balance.
Major U.S. defence contractors involved in the programme include Huntington Ingalls Industries, General Dynamics Electric Boat, General Dynamics Mission Systems, Lockheed Martin, Progeny Systems and Systems Planning and Analysis. The State Department added that the proposed sale will not adversely affect U.S. defence readiness.
