The Aircrew Selection Centre was at RAF Hornchurch until 1962, when it was merged with the Officer Selection Centre at RAF Uxbridge, and relocated to RAF Biggin Hill, that had been vacated by the Auxiliary squadrons, as the OASC. ITS moved from Kirton in Lindsey to South Cerney in 1957, was rebadged as the Aircrew Officer Training School and later had the Primary Flying Squadron with Chipmunks added before the whole lot relocated to RAF Church Fenton in 1968.