Boeing and Northrop have submitted a final proposal for the US Missile Defense Agency (MDA) ground-based midcourse defence (GMD) development and sustainment contract.

The contract involves development, manufacturing, testing, training, operations and sustainment support for the GMD element of the ballistic missile defence system.

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Boeing has supported the MDA as the prime contractor for the GMD programme since 2001.

Boeing and Northrop are competing for the contract against a Lockheed Martin-led GMD team that also includes Raytheon, ATK Aerospace Systems and Harris Corporation among others.

GMD uses radars, command-and-control facilities, communications terminals and a 20,000-mile fibre-optic communications network to defend the US against long-range ballistic missile threats.