109 Signals Squadron, Royal Australian Corps of Signals is an independent military communications sub-unit of the Australian Army. Signals have been represented in Western Australia since 1906 when a company of Signallers was formed and located in Perth and Fremantle. The Corps units in Western Australia have undergone many name changes since 1906. After becoming the Royal Australian Corps of Signals in 1925 and serving during the Second World War only two main units were left operating in Western Australia; Headquarters Western Command Signal Squadron and Western Command Intercom Troop.