Career
He first joined the Royal Canadian Air Force in 1942 as a pilot and later transferred to the Royal Canadian Navy after World World War World War II He served as commander of the Canadian Flotilla Atlantic, as Vice Chief of the Defence Staff from 1974 to 1977, as Chief of Defence Staff of the Canadian Forces from 1977 to 1980 and as chairman of the North Atlantic Treaty Organization Military Committee from 1980 to 1983. He later became president of the Canadian Centre for Arms Control and Disarmament (now the Canadian Council for International Peace and Security).