The Phantom's role changed to air defence in October 1974 when the airfield transferred to 11 Group in RAF Strike Command, when the SEPECAT Jaguar (situated in Norfolk) took over the ground attack role. 111 Squadron were the first to take the new air defence Phantoms. During 1975, the UK's air defence transferred to the Phantom FGR.2 from five squadrons of Lightnings. The UK was covered by NATO Early Warning Area 12. Three Sector Operations Centres were at Buchan, Boulmer and Neatishead; in the 1960s, the UK had the Linesman/Mediator radar system, which was obsolete by the 1970s. No 29 Squadron formed with Phantoms at Coningsby on 1 January 1975; until then the Phantom FG.1 had been operating with the Royal Navy only. On 3 March 1975 a Phantom crashed into a nearby house, with both pilot and navigator ejecting. The Queen visited the station on 30 June 1976.