Royal Air Force Menwith Hill (RAF Menwith Hill) is a Royal Air Force station near Harrogate, North Yorkshire, England, which provides communications and intelligence support services to the United Kingdom and the United States.
The site contains an extensive satellite ground station and is a communications intercept and missile warning site.[1] It has been described as the largest electronic monitoring station in the world.
RAF Menwith Hill is owned by the Ministry of Defence (MoD), but made available to the US Department of Defense (DoD) under the NATO Status of Forces Agreement 1951 and other, undisclosed agreements between the US and British governments.
His Majesty's Government (HMG) is entitled to possession of the site and retains control over its use and its facilities, though the administration of the base is the responsibility of the US authorities, with support provided by around 400 staff from Government Communications Headquarters (GCHQ), in addition to United States Air Force (USAF) and US National Security Agency (NSA) personnel. In 2014, the number of American personnel was reduced as part of a streamlining of operations due to improvements in technology.
The site acts as a ground station for a number of satellites operated by the US National Reconnaissance Office,[5] on behalf of the NSA, with antennas contained in numerous distinctive white radomes, locally referred to as "the golf balls", and is alleged to be an element of the ECHELON system.
The site is one of three main sites operated by the United States across the globe as a major satellite monitoring station and intelligence gathering location.
The other two sites are located in America and Australia, having similar roles and working together with RAF Menwith Hill to develop knowledge around American, British and Australian interests. The Australian site is known as the Joint Defence Facility Pine Gap.
Royal Air Force Mildenhall or more simply RAF Mildenhall (IATA: MHZ, ICAO: EGUN) is a Royal Air Force station located near Mildenhall in Suffolk, England.
Despite its status as a Royal Air Force station, it primarily supports United States Air Force (USAF) operations, and is currently the home of the 100th Air Refueling Wing (100 ARW). During the Second World War, RAF Bomber Command used the station for operational combat missions until 1945. Placed on standby status after the war, it was reopened by the Royal Air Force and became a USAF-RAF joint operation base on 11 July 1950.
It was assigned to Strategic Air Command (SAC), and began hosting B-50 Superfortresses in 1951, and KC-97 Stratofreighters from 1953 until 1958. The Military Air Transport Service transferred its main United Kingdom terminal to Mildenhall in 1958. In the late 1970s and throughout the 1980s U-2 and SR-71 Blackbird operations took place from the base.
On 8 January 2015, the United States Department of Defense announced that operations at RAF Mildenhall would end and be relocated to Germany (Spangdahlem Air Base) and elsewhere within the UK. After a period of uncertainty it was confirmed in July 2020 that the relocation of operations would no longer take place. RAF Mildenhall, together with its sister base RAF Lakenheath, have the largest United States Air Force presence in the United Kingdom.