 A year later he was promoted to captain and in 1945, he acted as brigadier in the Force's headquarter.Campbell was sent to the British embassy in Cairo as adviser to Ralph Bunche and to Folke Bernadotte in 1948 and subsequently was despatched to Ethiopia, where he was awarded a gold medal by Emperor Haile Selassie.In 1951, he was transferred to the King's Royal Rifle Corps.