For those who don't know Australia introduced selective conscription in 1964 to expand the Army for service oversea, firstly for the Confrontation in Borneo and secondly for the looming trouble in Vietnam. When it was in action about half of the soldiers in the 3 battalions in Vietnam were conscripts, so it really was a selective system.
WI Australia didn't introduce conscription and instead callled up the reserves to fill out battalions in active service?