Upon graduation of Infantry Officer Candidate School in November 1951 Colonel Thomason served as an Instructor with 147th Armd Signal Co, 7th Armd Division, Camp Roberts. He then served as a Platoon Leader, Executive Officer and Company Commander with E Company, 7th Infantry Regiment, 3d Infantry Division, Korea.  He returned to the states in 1953 and served as Instructor, 82d Abn Division, Fort Bragg, from 1954 to 1956 he served with the 6023d Personnel Center, Fort Ord as Executive Officer and Company Commander. In 1947 he attended the U.S. Army Language School, Presidio of Monterey, California. He was in Germany from 1958-1959 where he served as Civil Affairs Officer, and Post Adjutant at Wurzburg. Upon his return to the States he attended the Adjutant General School, Fort Harrison, Indiana. From 1960-1962 he served as Assistant Branch Chief and Branch Chief, Military Pers Division, Adjutant General Office, at Fort Meade, Maryland. In 1962 he returned to the Adjutant General School as a student and instructor with Management and Manpower Control. In 1964 he attended Indiana University as a Graduate Student and obtained his MBA degree.  He then attended the U.S. Army Command and General Staff College. He was the Adjutant General, 4th Infantry Division, Vietnam. He served as Systems Development Officer and Management Instructor Systems Director with the Office of the Assistant Vice Chief Staff. He then attended the United States Army War College in June 1970. He was Branch Chief of the Staff Management Division in 1971. Colonel Thomason’s present duty assignment is Chief, Congressional Inquiry Division, Office of the Secretary of the Army. | Colonel Thomason’s awards and decorations include the Silver Star, Bronze Star Medal with V Device and Oak Leaf Cluster and Purple Heart.