在日米軍
In July 1977 Ginn was assigned as assistant chief of staff for operations, Supreme Headquarters Allied Powers Europe in Belgium. He was responsible for operational readiness and training of Allied Command Europe forces. In June 1979 he was promoted to the rank of lieutenant general and became the Commander of the United States Forces Japan and Fifth Air Force with headquarters at Yokota Air Base, Japan and he retired at this position in October 1981 after 34 years of military service.