High Quality Content by WIKIPEDIA articles! Supreme Allied Commander is the title held by the most senior commander within certain multinational military alliances. It originated as a term used by the Western Allies during World War II, and is currently used only within NATO. Dwight Eisenhower served as Supreme Commander Allied Expeditionary Force (SCAEF) for the Battle of Normandy during World War II. The current commander of NATO's Allied Command Operations has the title Supreme Allied Commander Europe (SACEUR).