On this day, No 4 Forward Air Control Flight was formed as an independent unit at RAAF Base Williamtown, NSW, to train RAAF, RAN and Army pilots in 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 grenades 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. The Australian-designed and built Winjeel had been the RAAF’s basic trainer since 1955. Although it was retired from the training role in 1975, the Winjeel continued in the FAC role until 1995. Although the Flight was disbanded in January 1989, the FAC function and the Winjeels were transferred to No 76 Squadron. No 4 Squadron was reformed in 2009 (see 2 July) to carry out the FAC role.