Sources indicate that 444 Signals Unit (SU) formed officially within No. 90 (Signals) Group RAF, Strike Command with effect from 16 August 1971, and was established as a lodger unit at Stanley Fort, Hong Kong. The primary role of 444 SU was to act as a ground station for the Skynet satellite communications system, responsibility for operating the Skynet system having been vested in the RAF in the late 1960s, under the Rationalisation of Inter Services Telecommunications (RISTACOM) agreement. It would appear that the equipment operated by 444 SU had been located previously at RAF Bahrain (HMS "Jufair").