8/9 RAR was formed on 31 October 1973 by linking 8th Battalion , Royal Australian Regiment and 9th Battalion , Royal Australian Regiment as part of cutbacks to the army following the end of the Vietnam War . Upon formation the unit was based at Enoggera Barracks in Brisbane where it formed part of the 6th Brigade . The battalion 's first major task came in the wake of the 1974 Brisbane flood , when it assisted with the subsequent disaster relief and cleanup efforts
1974 Brisbane flood
1974 Brisbane flood
8th/9th Battalion, Royal Australian Regiment