Supreme Headquarters Allied Powers Europe was withdrawing from the NATO military structure. SHAPE and all the other NATO installations, including NATO Headquarters and Allied Forces Central Europe (AFCENT), were informed that they must leave French territory by April 1967. Belgium became the host nation for both NATO's political headquarters and SHAPE. General Lyman Lemnitzer, SACEUR at the time, had hoped that SHAPE could be located near to NATO Headquarters, as had been the case in Paris, but the Belgian authorities decided that SHAPE should be located at least 50 kilometres from Brussels, NATO's new location, because SHAPE was a major wartime military target. The Belgian
Supreme Headquarters Allied Powers Europe Mediterranean Sea. To improve alliance military readiness and integration, NATO continued to hold annual alliance-wide military exercises each autumn ("FALLEX") that was jointly planned and executed by SACEUR and SACLANT forces. From 1967 however, under 'flexible response', the aim became to build up conventional forces so that, if possible, nuclear weapons might not be needed. However it was made clear that first use of nuclear weapons might be necessary if the conventional defences were being overwhelmed. Eventually SACEUR was allocated planning control of a small number of US and British ballistic missile submarines, and some 7,000 tactical nuclear weapons were