when did the australian defence force establish?
1976
Australian Defence Force
 In 1976, the government made a strategic change and established the ADF to place the services under a single headquarters.
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Australian Defence Force [SEP] Introduction
The Australian Defence Force (ADF) is the military organisation responsible for the defence of Australia and its national interests. It consists of the Royal Australian Navy (RAN), Australian Army, Royal Australian Air Force (RAAF) and several "tri-service" units. The ADF has a strength of just over 85,000 full-time personnel and active reservists and is supported by the Department of Defence and several other civilian agencies. During the first decades of the 20th century, the Australian Government established the armed services as separate organisations. Each service had an independent chain of command. In 1976, the government made a strategic change and established the ADF to place the services under a single headquarters.