From Wikipedia:
The Australian Flying Corps remained part of the Australian Army until 1919, when it was disbanded along with the First Australian Imperial Force (AIF). Although the Central Flying School continued to operate at Point Cook, military flying virtually ceased until 1920, when the Australian Air Corps (AAC) was formed. The Australian Air Force was formed on 31 March 1921. King George V approved the prefix "Royal" in June 1921 and became effective on 31 August 1921.
The AFC up to 1919 would have worn a Rising Sun badge.
Not sure when the RAAF KC hat badge came into being.
Mick
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