The Special Air Service Regiment (SASR) is a Special Forces regiment modelled on the original British SAS and also drawing on the traditions of the Australian World War II 'Z' Special Force commando unit, as well as the Independent Companies which were active in the South Pacific during the same period. It is based at Campbell Barracks, Swanbourne, Perth, Western Australia and is a unit of the Royal Australian Corps of Infantry, part of the Australian Defence Force.