Royal Air Force and replacement by the F-35, the RAF Lossiemouth-based 15 (Reserve) Squadron (the Tornado Operational Conversion Unit) was disbanded in March 2017. Lightning: On 23 November 2015 it was announced that a total of 138 F-35Bs will be ordered. 617 (The Dambusters) Squadron officially reformed on 18 April 2018 as an RAF Lightning Squadron. The first four aircraft arrived at RAF Marham on 7 June 2018. The Sentry AEW1, based at RAF Waddington, provides airborne early warning to detect incoming enemy aircraft and to co-ordinate the aerial battlefield. The Sentinel R1 (formally known as ASTOR – Airborne STand-Off Radar) provides a
RAF Bawtry RAF took it over and it became an RAF command centre. RAF Bawtry did not have its own airfield but instead took advantage of RAF Bircotes, which was located literally next-door. Here the station based a number of communications aircraft. Bawtry Hall served the Royal Air Force from 1941–1984; first as HQ for No. 1 Group, Bomber Command during and after the Second World War, then as Strike Command HQ up to and including the later stages of the Cold War. The famous bombing of the airfield at Port Stanley by Vulcan bombers from RAF Waddington during the Falklands War