The conflict was the most widespread in British history, with British Empire and Commonwealth troops fighting in campaigns from Europe and North Africa, to the Middle East and the Far East. Approximately 390,000 British Empire and Commonwealth troops lost their lives. Allied victory resulted in the defeat of the Axis powers and the establishment of the United Nations (replacing the League of nations). The Cold War Post–Second World War economic and political decline, as well as changing attitudes in British society and government, were reflected by the armed forces' contracting global role, and later epitomised by its political defeat during the Suez Crisis (1956). Reflecting Britain's new role in the world and the escalation of the Cold War (1947–1991), the country became a founding member of the NATO military alliance in 1949. Defence Reviews, such as those in 1957 and 1966, announced significant reductions in conventional forces, the pursuement of a doctrine based on nuclear deterrence, and a permanent military withdrawal East of Suez. By the mid-1970s, the armed forces had reconfigured to focus on the responsibilities allocated to them by NATO. The British Army of the Rhine and RAF Germany consequently represented the largest and most important overseas commitments that the armed forces had during this period, while the Royal Navy developed an anti-submarine warfare specialisation, with a particular focus on countering Soviet submarines in the Eastern Atlantic and North Sea. While NATO obligations took increased prominence, Britain nonetheless found itself engaged in a number of low-intensity conflicts, including a spate of insurgencies against colonial occupation. However the Dhofar Rebellion (1962–1976) and The Troubles (1969–1998) emerged as the primary operational concerns of the armed forces. Perhaps the most important conflict during the Cold War, at least in the context of British defence policy, was the Falklands War (1982). Since the end of the Cold War, an increasingly international role for the armed forces has been pursued, with re-structuring to deliver a greater focus on expeditionary warfare and power projection. This entailed the armed forces often constituting a major component in peacekeeping and humanitarian missions under the auspices of the United Nations, NATO, and other multinational operations, including: peacekeeping responsibilities in the Balkans and Cyprus, the 2000 intervention in Sierra Leone and participation in the UN-mandated no-fly zone over Libya (2011). Post-September 11, the armed forces have been heavily committed to the War on Terror (2001–present), with lengthy campaigns in