The British Armed Forces (also known as Her Majestys Armed Forces) are responsible for the defense of the United Kingdom and its overseas territories. They are also responsible for defending the UK, its overseas territories and Crown dependencies. Britain has been able to emerge victorious in many conflicts, establishing itself as one the most powerful military and economic countries.
The British Armed Forces today include the Royal Navy, a navy that is blue-water and has a fleet of 79 commissioned vessels, as well as the Royal Marines, an amphibious light infantry force and the British Army. The Royal Air Force is a technologically advanced air force that has a wide range of operational aircraft, both fixed-wing and mobile. The British Armed Forces includes standing forces, regular reserve, volunteer reserves, and sponsored reserves.
Head of the Armed Forces, the British monarch, Queen Elizabeth II, is the one to whom all members swear allegiance. A long-standing constitutional convention has de facto given the prime minister and secretary of state for defense executive power.