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 Drem Spitfire aircraft, and joined the RAF's Fighter Command. In 1942, Royal Navy personnel were posted to RAF Drem and in 1945 the unit was handed over to the Admiralty and renamed HMS Nighthawk. On 15 March 1946, the unit was returned to the Air Ministry although it was closed and then decommissioned not long after that. At present, the RAF Drem Museum is housed in what was RAF Drem's mess accommodation. RAF Drem Royal Air Force station Drem or RAF Drem is a former Royal Air Force station, just north of the village of Drem in East Lothian, Scotland. The