Was Britain's implementation of NATO strategy credible? After the adoption of Flexible Response in 1967 NATO relied on conventional forces to defend the West. Britain had a central role in NATO's plans, but was British defense planning adequate for the task? How did the Government plan for the use of the conventional Armed Forces for the range of operations it was committed to? How were the Armed Forces to be mobilized, and what was the detail of the planning for mobilization? In 1967 MC14/3 was adopted as the overall strategic concept by NATO. It relied on an escalatory deterrence, from conventional through tactical nuclear strikes to strategic nuclear attack. This is commonly known as Flexible Response and replaced NATO's trip-wire response. The declared principal of the strategic concept was to reduce the chance of mistakenly starting a nuclear war, meeting force with like force, and raising the nuclear threshold in the event of actual war.