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The Royal Air Force (RAF) is the air and space force of the United Kingdom, British Overseas Territories and Crown Dependencies. It was formed towards the end of the First World War on 1 April 1918 through the merger of the Royal Flying Corps (RFC) and the Royal Naval Air Service (RNAS). Following the Allied victory over the Central Powers in 1918, the RAF emerged as the largest air force in the world. Since its formation, the RAF has played a significant role in British military history. In particular, during the Second World War, the RAF defeated the German Luftwaffe's efforts to establish air superiority over England during the Battle of Britain, and played a key role in the Combined Bomber Offensive alongside the USAAF.