Supreme Headquarters Allied Powers Europe government offered Camp Casteau, a 2 km² Belgian Army summer training camp near Mons, which was an area in serious need of additional economic investment. In September 1966, NATO agreed that Belgium should host SHAPE at Casteau. SHAPE closed its facility at Rocquencourt near Paris on 30 March 1967, and the next day held a ceremony to mark the opening of the new headquarters at Casteau. The drawdown of the British Mediterranean Fleet, the military difficulties of the politically decided command structure, and the withdrawal of the French from the military command structure forced a rearrangement of the command arrangements
Supreme Allied Commander Atlantic the principal adviser to the SACLANT on submarine matters and undersea warfare. COMSUBACLANT was an American three-star admiral based in Norfolk, Virginia, who also served as the Commander Submarine Force Atlantic Fleet (COMSUBLANT). Under SUBACLANT were Commander, Submarines, Western Atlantic Area (COMSUBWESTLANT) and Commander, Submarines, Eastern Atlantic Area (COMSUBEASTLANT). COMSUBEASTLANT's national appointment was the Royal Navy post of Flag Officer Submarines. Flag Officer Submarines moved in 1978 from HMS Dolphin at Gosport to the Northwood Headquarters in northwest London. His Second-in-Command was the Deputy Supreme Allied Commander Atlantic: Supreme Allied Commander Atlantic The Supreme Allied Commander Atlantic (SACLANT) was one