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 Morale, Welfare and Recreation Department.