Yoshio Kozuki became an infantry officer in 1909 and was a language officer in Germany. He served in several positions until August 1940, when he became commander of the 19th Division, based in Korea.
On July 4, 1942, he was appointed Commander of the 2nd Army based in Manchukuo. On May 28, 1943, he took command of the Mongolia Garrison Army. In November 1944, he became Commander of the 11th Army and in April 1945 of the Seventeenth Area Army in Korea, which was demobilized in August 1945 without having seen combat.
After the war, he was Vice Minister of Demobilization and in 1947, he became Head of the Demobilization Bureau, which fell under the Ministry of Health and Welfare.
