M Special Unit, was a joint Allied special reconnaissance unit, part of the Services Reconnaissance Department, in the South West Pacific theatre of World War II. A joint Australian, New Zealand and British military intelligence unit, it saw action in New Guinea and the Solomon Islands between 1943–1945, against the Empire of Japan. Perhaps the best-known member of M Special Unit was Sergeant Leonard Siffleet, who was executed after being taken prisoner in 1943. A photograph of Siffleet in his last moments achieved iconic status following the war.