The history of the Royal Canadian Air Force begins in 1920, when the air force was created as the Canadian Air Force (CAF). In 1924 the CAF was renamed the Royal Canadian Air Force (RCAF) when it was granted the royal title by King George V. The RCAF existed as an independent service until 1968. Prior attempts at forming an air force for Canada were the Canadian Aviation Corps that was attached to the Canadian Expeditionary Force, and a two-squadron Canadian Air Force that was attached to the Royal Air Force.