He returned to Sweden where he was promoted to captain in 1948 before travelling to Ethiopia to train officers for Emperor Haile Selassie's Imperial Guards.
Nauclér was deployed in Korea with the Kagnew Battalion during the Korean War in 1951 and also served as head of the Ethiopian Liaison Section in Tokyo.
Furthermore, Nauclér was platoon leader and battalion commander during the Continuation War in Finland from 1941 to 1942 and back in Sweden he completed the general course at the Artillery and Engineering College in 1945.
[5] The journey from Djibouti, via Bangkok to Pusan in the American troopship USS General J. H. McRae took three weeks.
It arrived in the Port of Pusan in the morning 6 May 1951, where the South Korean President Syngman Rhee and representatives of the UN forces in Korea were waiting.
In 1956 he was appointed major and chief of Section III and the staff company of the Swedish UN Battalion I in Egypt.
Back in Sweden again, he was commander of the National Home Guard Combat School from 1957 to 1963 when he retired from military service.