The military career of Keith Miller, an Australian Test cricketer and Australian rules footballer, lasted from August 1940 until June 1946, when World War II interrupted his sporting career. Miller enlisted in the Militia, before switching to the Royal Australian Air Force, where he served from November 1941 until 1946 when he was discharged with the rank of flying officer. Miller trained as a fighter pilot, and in the last month of the European theatre of war, he flew combat missions over German installations. However, Miller was more notable for his efforts as a cricketer, representing the Royal Australian Air Force cricket team and after VE Day, the Australian Services in the Victory Tests of 1945, followed by a tour of the Indian subcontinent and Australia before being demobilised.