On this day, No 4 Forward Air Control Flight was formed as an independent unit at RAAF Base Williamtown, New South Wales, to train RAAF, RAN and Army pilots in all facets of Forward Air Control (FAC) work. The unit commenced with four CAC Winjeel aircraft fitted with UHF radios (the frequency band used for Army tactical nets) and smoke rockets for target marking, and an establishment of just two personnel. It flew its first mission in conjunction with the Army at Singleton, NSW, on 6 April, using aircraft A85-413. The Australian-designed and built Winjeel had been the RAAF’s basic trainer since 1955. Although it had been planned to retire the type from 1968, it was still considered suitable for FAC work and continued in use in this role until 1977. Although the Flight was disbanded in January 1989, the FAC function became the role of No 4 Squadron formed in 2009 (see 2 July).