Z Force, properly titled the Z Special Unit. A combined ANZAC and Allied forces special unit that operated in the Pacific theatre in WWII.
http://en.wikipedia.org/wiki/Z_Special_Unit
They conducted some seriously ballsy ops, particularly Operation Jaywick in which unit members disguised as Indonesian fishermen were able to sail to Singapore where they infiltrated the main harbour and used limpet mines to sink four Japanese ships.
One of their last surviving members, a Chinese-Australian man named Jack Sue, lived here in Perth and only died a couple of years ago.