Lockheed Martin UK, headquartered in London, is the UK-based arm of Lockheed Martin Corporation. Lockheed Martin UK specialises in the development, integration and sustainment of advanced technology systems, products and services. The company employs approximately 2,000 people in the UK across more than 20 sites, working on a wide range of major programmes spanning the aerospace, defence and civil sectors. For more than 50 years, the US and the UK have worked closely on submarine-based strategic deterrence. Lockheed Martin plays a key role, working through the US Navy to supply the Trident II D5 missile to both nations for this mission. Lockheed Martin UK supports this mission in a multitude of roles across sites in the UK including HMNB Clyde, Bristol, Plymouth and Ampthill, as well as through its shareholding of AWE Management Ltd and partnership in the ABL Alliance managing the Royal Naval Armament Depot (RNAD) at Coulport.