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 Hemswell Bawtry in 1987 and entire Married Quarter sites also nearby at RAF Scampton, RAF Finningley and RAF Cranwell. Throughout the years of operation, RAF Hemswell's mascot and motto were a large weasel rearing-up on its hind legs ready to strike and the words "Bold and Tenacious" emblazoned over (or under) it. Hemswell was used as a substitute for RAF Scampton in the ground-based filming of the 1954 film "The Dam Busters" as the wartime layout of both Scampton and Hemswell was similar in many places. The film "Night Bombers" remains the best known filmed record of what RAF Hemswell looked