Western Australia; T: Tasmania; D: Northern Territory. The serial numbers of female soldiers followed this with an F. AIF serial numbers then had an X. A low number indicated an early enlistment. General Sir Thomas Blamey was VX1. Soldiers transferring from the Militia often kept their old number with 100,000 added, while PMF officers had 200,000 added. Following the Second World War, the system employed by the Australian Army was quite complex, as the Second AIF was disbanded and an Interim Army was established. A dual system existed until July 1947 as existing personnel kept their Second AIF numbers until that point, while new enlistments received a service number starting from X500000, while maintaining the state-based prefix of the old Second AIF system. For the second half of 1947, numbers were allocated starting from X700000, again prefixed with the state of recruitment. However, from September 1947, another system based on military districts was introduced for members of the Australian Regular Army, while personnel who enlisted specifically for service during the Korean War with K-Force received numbers beginning from 400,000, although those who volunteered for service with the Regular Army Supplement received a new number beginning with 900,000 and others who transferred from the Interim Army to K-Force received a new number beginning with 905,000, beginning with a number from 1 to 8 representing each state and territory (beginning with Queensland), including Papua New Guinea. This system (the 900,000 series) remained in use until 2002, when it was replaced with an integrated system based on the Personnel Management Key Solution (PMKeyS) system, which moved the Australian Defence Force away from service numbers to employee numbers. Canada Canada began using "Regimental Numbers" during the First World War. During the Second World War, units were allocated blocks of Regimental Numbers to issue out, usually in the 5 or 6 digit range, though extremely low numbers were also possible due to the blocks. X12345: the X was an alphabetic character denoting the Military District the soldier was recruited in (A represented MD1, B MD2, etc.) Up until 1945, officers never received numbers and were identified by name and rank only. The Social Insurance Number (SIN) replaced the regimental number in the 1960s. 123 456 789 The SIN was itself replaced by a Service Number in the 1990s. X12 345 678 The use of the SIN was granted by Revenue Canada to the CF for