Supreme Headquarters Allied Powers Europe Supreme Headquarters Allied Powers Europe Supreme Headquarters Allied Powers Europe (SHAPE) is the headquarters of the North Atlantic Treaty Organization's Allied Command Operations (ACO). SHAPE is located at Casteau, north of the Belgian city of Mons. The commander of ACO and SHAPE is Supreme Allied Commander Europe (SACEUR), a U.S. four-star general officer or flag officer who also serves as Commander, U.S. European Command. Since 1967 it has been located at Casteau, north of the Belgian city of Mons, but it had previously been located, from 1953, at Rocquencourt, next to Versailles, France. From 1951 to 2003, SHAPE was the
NORTHAG wartime structure in 1989 There were two additional French corps (III Corps, ) associated with the Army Group. In 1966, France had withdrawn from the NATO Command Structure, but still wished to take part in the defence of Western Europe. A series of secret agreements made between NATOs Supreme Allied Commander Europe (SACEUR) and the French Chief of the Defence Staff detailed how French forces would reintegrate into the NATO Command Structure in case of war. At the outbreak of hostilities the French First Army would be placed directly under the command of Supreme Headquarters Allied Powers Europe (SHAPE), which would employ the three