 Upon the withdrawal of British forces from Singapore, RAF Changi was renamed as Changi Air Base (CAB) and was handed over to the SADC (predecessor of Republic of Singapore Air Force) on 9 December 1971.Thereafter, the airfield received its first flying squadron of SADC – the Alouette Squadron and their Alouette IIIs helicopters shortly after New Year's Day 1972.With the arrival of the first Shorts Skyvans in 1973, SADC began to form the 121 Squadron at Changi Air Base and it is currently the oldest resident squadron of the airfield.