The Australian Defence Force (ADF) is the military organisation responsible for the defence of Australia. It consists of the Royal Australian Navy, Australian Army, Royal Australian Air Force and a number of 'tri-service' units. During the first decades of the 20th century, the Australian Government established three separate armed services. 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. Over time, the degree of integration has increased and tri-service headquarters, logistics and training institutions have supplanted many single-service establishments.
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