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| Australian Army units and formations | |
|---|---|
| Name | Australian Army units and formations |
| Country | Australia |
| Branch | Australian Defence Force |
| Type | Land forces |
| Role | National defence, expeditionary operations, peacekeeping, humanitarian assistance |
| Garrison | Canberra |
| Motto | "For Home, For King" |
Australian Army units and formations provide the institutional framework through which the Australian Defence Force projects land power. These formations encompass combat, combat support, combat service support, training and command elements organised into divisions, brigades, regiments, battalions, squadrons and specialist corps. They trace their lineage through colonial militia units, the Australian Imperial Force, interwar reorganisations, the Second World War, postwar national service, and modern restructurings influenced by deployments to Korea, Vietnam War, East Timor, Iraq War and Afghanistan.
The evolution of Australian Army units and formations reflects colonial militia traditions such as the New South Wales Corps and the Victorian Volunteer Rifles, the creation of the Australian Imperial Force for the First World War, and the expansion into multiple expeditionary corps during the Second World War. Post-1945 conscription debates, the National Service Scheme, and the transition from the Citizens Military Forces to the Australian Army Reserve reshaped order-of-battle and force generation. Late 20th- and early 21st-century reforms, including Plan Beersheba and the reorganisation responding to the Defence White Paper (2013), affected the composition of divisions, brigades and specialist corps during operations such as INTERFET in Timor-Leste and Operation Slipper in Afghanistan.
The Australian Army is structured across headquarters, operational commands, formation headquarters and subordinate units. Key commands include Forces Command, 1st (Australian) Division, and Headquarters Joint Operations Command interfaces with the Australian Defence Force Academy. Army formations are tailored into combined-arms brigades, specialist regiments and corps-level capabilities such as the Royal Australian Artillery, Royal Australian Armoured Corps, and Royal Australian Infantry Corps. Reserve integration occurs through aligned brigades and community-based regiments drawn from states and territories including New South Wales, Victoria, Queensland, Western Australia, South Australia, Tasmania, Australian Capital Territory and Northern Territory.
Combat arms and corps deliver direct combat effects and include the Royal Australian Infantry Corps, Royal Australian Armoured Corps, Royal Australian Artillery, Corps of Royal Australian Engineers, and Royal Australian Corps of Signals. Specialist corps supporting lethality and information dominance include the Royal Australian Electrical and Mechanical Engineers, Royal Australian Army Medical Corps, Royal Australian Army Ordnance Corps, Royal Australian Corps of Transport, Royal Australian Army Legal Corps and Royal Australian Corps of Military Police. Historical corps such as the Australian Flying Corps influenced the development of current capabilities alongside joint elements like the Australian Army Aviation Corps.
Regular units form the full-time backbone, including battalions of the Royal Australian Regiment, armoured regiments such as those forming the 1st Armoured Regiment lineage, and combat support elements under Forces Command. Reserve units comprise the Australian Army Reserve brigades, regionally based light infantry battalions, and specialist reserve regiments tied to community recruitment networks and memorial traditions of units like The Royal Victoria Regiment. Special Forces units include 1st Commando Regiment (Reserve), the regular 1st Regiment, Royal Australian Artillery-affiliated elements for fires support to special operations, and the premier operational units within Special Operations Command such as the Special Air Service Regiment and 2nd Commando Regiment.
Large formations such as 1st (Australian) Division and historically the 2nd Division (Australia) constitute headquarters for campaign-level command. Brigades—organic combined-arms formations like the 1st Brigade (Australia), 3rd Brigade (Australia), and the mechanised 7th Brigade (Australia)—aggregate infantry, armour, artillery and support. Battalions of the Royal Australian Regiment (1 RAR, 2 RAR, 3 RAR, etc.) and state-based battalions within the Australian Army Reserve provide manoeuvre elements. Regimental systems preserve heritage, with units such as the Royal Australian Regiment, The Royal Queensland Regiment, The Royal New South Wales Regiment and others maintaining battle honours from campaigns including Gallipoli and the Western Front.
Sustainment is delivered by logistic brigades and corps-level services including 7th Combat Brigade-aligned support, the 1st Commando Regiment-adjacent logistics, and the national logistics system run by the Royal Australian Army Ordnance Corps, Royal Australian Corps of Transport, Royal Australian Electrical and Mechanical Engineers and Australian Army Catering Corps legacy elements. Engineer formations from the Corps of Royal Australian Engineers provide mobility, counter-mobility and survivability in operations such as disaster relief after events in Queensland and New South Wales. Medical units from the Royal Australian Army Medical Corps and specialist veterinary and dental detachments support force health and force generation cycles.
Doctrine, training and command are developed and promulgated by institutions including the Land Warfare Centre, Australian Army Research Centre-related activities, Royal Military College, Duntroon, and joint establishments like the Australian Defence Force Academy and Australian Command and Staff College. Force generation and readiness are overseen by headquarters such as Forces Command and the divisional staffs of 1st (Australian) Division, while doctrine aligns with allied frameworks from partners including the United Kingdom, United States, and regional defence partners engaged through forums like the Five Power Defence Arrangements and ASEAN Defence Ministers' Meeting Plus.