From 1933–1935 at Fort McKinley Quinn was the commanding officer of Company L, 5th Infantry Regiment. 1935–1936 General Quinn was assigned to Company D and then from 1936–1938 assigned to the Headquarters Company of the 31st Infantry Regiment. In 1940 he was the Command of Headquarters Company of the 4th Infantry Division, and the Commanding Officers of Company D, 8th Infantry Division. In July 1942 he became the Chief of Staff of the G-2, IV Army Corps.
In 1949 Quinn was the Commanding Officer of the 3rd Battalion, 34th Infantry Regiment. In April 1949 he became Chief of the Training Sub-section, I Corps. In January 1950 he became the Assistant Chief of Staff of the G-3, I Corps from February to March. In January 1951, Quinn was the Commanding Officer of the 17th Infantry Regiment, 7th Infantry Division in Korea. In 1952 Quinn became the Deputy Chief of Staff of the Pentagon and Deputy Chief of Staff for Planning Coordination of the Office of Chief of Staff, and then eventually became the Chief of Staff of the Pentagon. In 1953 Quinn was transferred to Greece and to be the Head of the Army Section, Joint Military Aid Group to Greece.
In January 1957 he was the Commanding Officer of the 4th Infantry Division of the Strategic Army Corps at Fort Lewis. In July 1958 he became the Deputy Chief of Staff for the G-2 Intelligence of the United States Army. From 1959–1961, Quinn served as the Army's Chief of Information, and in 1959 he became the Chief of Public Information of the Department of the Army. In 1961 Quinn became the Deputy Director of the Defense Intelligence Agency and promoted to lieutenant general.
From 1964–1966, Quinn was the Commanding General of the Seventh United States Army, commonly referred to as 7th Army, in Stuttgart-Vaihingen, Germany.
On March 1, 1966 Quinn retired and became Honorary Colonel of the 17th Infantry, nicknamed "The Buffalos".
Quinn participated in Operation Dragoon and on January 1, 1945 he was part of Operation Northwind. As Acting Chief of Staff, G-2, HQ, Seventh Army, he arrived after the liberation of the Dachau concentration camp, later saying "'the atrocities […] were just too horrible to describe."[3] Seeing the need to document and preserve what he saw, Quinn commissioned the Dachau report.[3]
Korea
Quinn was in Korea from 1951 to 1952 and in August 1951 Quinn was wounded in Korea. While in Korea he was awarded the Silver Star, Legion of Merit and the Bronze Star with the "V" Device. He was also in the Battle of Inchon. While he was in Korea he was the commanding Officer of the 17th Infantry Regiment which was part of the 7th Infantry Division (the 17th Infantry was, and still is, nicknamed "the Buffalos").
Occupations
He was Vice President of the Aerospace Group program at Martin Marietta Corporation until 1972; and then afterwards he established Quinn Associates, a consulting firm.
Quinn was married to Sara Bette Williams, who is buried next to him at Arlington National Cemetery. Together they had three children: Donna, William Jr., and Sally Quinn.
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