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The Australian Army is one of three branches of the Australian Defence Force. It was formed in 1901 and has been involved in a number of military conflicts abroad during its history, including the Second Boer War and both World Wars. Since 1947 it has also participated in internatonal peacekeeping efforts, usually organised by the United Nations.
Volunteer expeditionary forces, known respectively as the First and Second Australian Imperial Forces, were formed to fight overseas during the two World Wars.