of miles of telephone and telex connections. The work was mainly carried out by the Marconi Wireless and Telegraph Company in several phases, called ROTOR 1, ROTOR 2 and ROTOR 3. Post-ROTOR As work on the Microwave Early Warning system began, researchers at the Royal Radar Establishment were experimenting with new cavity magnetrons and crystal detectors that, combined with a ad hoc antenna, increased the range of their existing microwave radars on the order of four times. While the resulting "Green Garlic" did not meet all of the requirements for the original MEW, it was close enough and would be available years earlier. The decision was made to make the MEW a long-term development with additional features such as moving target indication while the Green Garlic would be mated to an enormous antenna that would give it range over . Installations, under the name AMES Type 80, began in 1954 with the first systems declared operational the next year. As installations continued, it was found that the accuracy was such that it could also be used to direct the interceptors, with no need to forward the information to the ROTOR control centres. By concentrating all of the plotting at a single site the total number of operators was greatly reduced. As a result of the introduction of the Type 80, many of the existing ROTOR sites were rationalized into Master Radar Stations (MRS), while the rest were made redundant, some only two years after opening. During the same period, the introduction of the first surface-to-air missiles rendered the anti-aircraft guns obsolete, and the Army handed the air defence mission entirely to the RAF. All of the AAOR sites were closed. A few of the ROTOR and AAOR stations were re-used for Regional Seats of Government or local authority wartime headquarters. Until the end of the Cold War, many of the sites were retained by the government. They were later sold to private buyers, converted into museums (for example Hack Green) or transferred to the National Air Traffic Control Centre. UK sites At the Radar Research Establishment in Malvern, Worcestershire a ROTOR bunker was constructed above ground to allow equipment to be tested in an operational environment. The building, locally designated as H Building, originally incorporated a replica of the sector operations centre at RAF Bawburgh. The building was demolished June 2020. The sites today RAF Staxton Wold is the only