 Before Britain developed its own nuclear weapons the RAF was provided with American nuclear weapons under Project E. However following the development of its own arsenal, the British Government elected on 16 February 1960 to share the country's nuclear deterrent between the RAF and submarines of the Royal Navy, first deciding on 13 April to concentrate solely on the air force's V bomber fleet.These were initially armed with nuclear gravity bombs, later being equipped with the Blue Steel missile.Following the development of the Royal Navy's Polaris submarines, the strategic nuclear deterrent passed to the navy's submarines on 30 June 1969.