In December 1950, with the appointment of General Eisenhower as the first Supreme Allied Commander Europe (SACEUR), the members of the Treaty of Brussels decided to transfer the headquarters, personnel, and plans of the Western Union Defence Organisation (WUDO) to NATO.[4] NATO's Supreme Headquarters Allied Powers Europe (SHAPE) took over responsibility for the defence of Western Europe, while the physical headquarters in Fontainebleau were transformed into NATO's Headquarters, Allied Forces Central Europe (AFCENT).[2][3][4][8] Field Marshal Bernard Montgomery resigned as Chairman of WUDO’s Land, Naval and Air Commanders-in-Chief Committee on 31 March 1951 and took the position of Deputy Supreme Allied Commander Europe (DSACEUR) on 1 April 1951.