The Citizen Military Force (also known as the Civilian Military Force, the Citizen Militia Force, the CMF, as well as the Australian Militia Force and the AMF) was the primary defenders of the Australian mainland, the islands around Australia, and all points south of the Asian mainland under Australian influence until February, 1943 -- when the Australian Imperial Forces (AIF) began returning from North Africa and The Middle East to help stave off the Japanese threat. This is an over-simplification of the situation, but serves well enough in game terms.*
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As the War progressed the difference between the CMF and the AIF became increasingly more political than military. From 1943 through the end of the War, the CMF fought in Brigade and Division size operations all through the Pacific Theater.*
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The CMF was essentially the Australian Militia, while the AIF was the "regular army."*
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CMF units should only be used in the Pacific Theater of Operations.*
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In the early Pacific campaign, the overwhelming predominant composition of Australian forces should be CMF units, as the AIF was primarily in the Mediterranean, the Middle East and North Africa. CMF units such as the New Guinea Volunteer Rifles would be the first to oppose the Japanese landings on New Guinea.*
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The CMF will have the normal array of military assets available to them, though usually in smaller numbers than the AIF, especially as related to armour.*
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These units can also represent the Volunteer Defence Corps (VDC) who were stationed in each of the homeland military districts, and the New Zealand Territorial Force.*
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The New Zealand Territorial Force did not get drawn into battle in the Pacific Theater, rather they manned defensive positions on New Zealand until the threat of Japanese invasion ended in the middle of 1943.  Thereafter they performed garrison duties on New Zealand.  That does not mean New Zealand was idle in the defense of the Pacific Theater, only that the "regular army" New Zealand Expeditionary Force was deployed into combat instead of the Territorial Forces.*
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The New Zealand Expeditionary Force, besides being active in Greece, North Africa and Italy, also defended Fiji, fought in the New Guinea Campaign and on many other islands in the Pacific.*