 He was promoted to war-substantive lieutenant-colonel in the Indian Army, to acting colonel on 15 November 1945 and to temporary colonel on 5 May 1946.He retired from the Indian Army on 3 January 1949 as an honorary brigadier.In a move to build confidence in the Burmese Union that would include all ethnic groups, Dun, a Karen, was appointed commander-in-chief of the Burmese army and of the police forces when Burma gained its independence from Britain following World War II.