In 1946, he was appointed a member of the War Crime Commission at Nuremberg. In November 1946 he was demobilized from the Royal Navy and resumed his real name and rejoined the Belgian army, returning to his former regiment. In 1951, he volunteered as a medical officer for the Belgian United Nations Corps in Korea during the Korean War where he was wounded while going to rescue a wounded soldier under enemy fire. He became the head of the medical service of the Belgian Army and retired in 1970, in the rank of major general.