 In 1921 , the decision was made to perpetuate the battle honours and traditions of the AIF by re @-@ organising the units of the Citizens Force to adopt the numerical designations of their related AIF units . The 27th Battalion had been recruited mainly from personnel that had served in the 74th ( Boothby ) Infantry Regiment , and as a result , on 1 May 1921 , the 74th 's successor units — the 2nd and 5th Battalions , 27th Regiment — were amalgamated to re @-@ raise the 27th Battalion . Through this link , the 27th inherited the battle honour " South Africa 1899 – 1902 " . Upon establishment , the battalion formed part of the 3rd Brigade and was based in South Australia where it formed part of the 4th Military District . 
