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 West Ruislip Chris Wormald. RAF West Ruislip RAF West Ruislip was a Ministry of Defence site, located in Ickenham within the London Borough of Hillingdon. The base was originally built as a depot for the Royal Air Force (RAF), split by what is now the Chiltern Main Line. North of the railway was RAF Blenheim Crescent, which housed the RAF Records Office and the depot's original personnel accommodation. The site was leased to the US Air Force in 1955, followed by the US Navy in 1975, eventually housing the Navy Exchange of the U.S. Naval Activities, United Kingdom command, and the Navy's