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
Supreme Headquarters Allied Powers Europe ACO as it became had more and more activities related to the NATO Response Force. Yet after Estonia, Latvia, and Lithuania joined the alliance, and especially after the 2008 Georgia-Russia war, more attention began to be paid to NATO's core Article 5 defence obligations. The three Baltic states' worries were specifically focused on a potential Russian threat. Thus while some exercises were ostentially run to prepare the NRF, sometimes they also included Article 5 aspects. Among these dual-purpose exercises was 'Steadfast Jazz', part of the NATO Exercise Steadfast series, which was run in November 2013 across a number of NATO