 While in this capacity, Smith was promoted again to Captain on April 13, 1920 and finally left this assignment in January 1921 in order to rejoin 14th Cavalry at Fort Des Moines, Iowa.After several months in Iowa, Smith was transferred to the staff of United States Military Academy at West Point, New York and served as an Instructor in the Department of Natural and Experimental Philosophy until September 1926, when he entered the Army Cavalry School at Fort Riley, Kansas.He graduated in June 1927 and joined 13th Cavalry Regiment located at Fort Riley.