There is no contract for the use of RAF Menwith Hill. The base is made available to the United States Visiting Force under the terms of the NATO Status of Forces Agreement 1951, and other confidential arrangements.
The use of RAF Fylingdales to provide the US with ballistic missile early warning data is governed by the Memorandum of Agreement Concerning Ballistic Missile Early Warning Station at Fylingdales Moor, Yorkshire 1960. This agreement is scheduled to remain in force while the North Atlantic Treaty remains in force. The use of the upgraded early warning radar at RAF Fylingdales to provide data for the US ballistic missile defence system is governed by the Memorandum of Understanding Concerning Ballistic Missile Defence. This agreement is scheduled to last for 25 years, and began in 2003.