Ministry of Defence

Military
Main article: British Armed Forces

HMS Queen Elizabeth, a Queen Elizabeth-class aircraft carrier underway in the Atlantic Ocean, October 2019
Her Majesty’s Armed Forces consist of three professional service branches: the Royal Navy and Royal Marines (forming the Naval Service), the British Army and the Royal Air Force.[248] The armed forces of the United Kingdom are managed by the Ministry of Defence and controlled by the Defence Council, chaired by the Secretary of State for Defence. The Commander-in-Chief is the British monarch, to whom members of the forces swear an oath of allegiance.[249] The Armed Forces are charged with protecting the UK and its overseas territories, promoting the UK’s global security interests and supporting international peacekeeping efforts. They are active and regular participants in NATO, including the Allied Rapid Reaction Corps, as well as the Five Power Defence Arrangements, RIMPAC and other worldwide coalition operations. Overseas garrisons and facilities are maintained in Ascension Island, Bahrain, Belize, Brunei, Canada, Cyprus, Diego Garcia, the Falkland Islands, Germany, Gibraltar, Kenya, Oman, Qatar and Singapore.[250][251]

The British armed forces played a key role in establishing the British Empire as the dominant world power in the 18th, 19th and early 20th centuries. By emerging victorious from conflicts, Britain has often been able to decisively influence world events. Since the end of the British Empire, the UK has remained a major military power. Following the end of the Cold War, defence policy has a stated assumption that “the most demanding operations” will be undertaken as part of a coalition.[252]

According to sources which include the Stockholm International Peace Research Institute and the International Institute for Strategic Studies, the UK has either the fourth- or the fifth-highest military expenditure. Total defence spending amounts to 2.0 per cent of national GDP.[253]