Supreme Allied Commander Europe (SACEUR)

The Supreme Allied Commander Europe (SACEUR) is the commander of the North Atlantic Treaty Organization's (NATO's) Allied Command Operations (ACO) and head of ACO's headquarters, Supreme Headquarters Allied Powers Europe (SHAPE). The commander is based at SHAPE in Casteau, Belgium. SACEUR is the second-highest military position within NATO, below only the Chair of the NATO Military Committee in terms of precedence.

SACEUR has always been held by a U.S. military officer, and the position is a dual-charge with that of Commander of United States European Command.