then returned to the 1st Cavalry Division at Fort Knox, where he was advanced to brigadier general and given command of the 7th Mechanized Brigade. Chaffee led the unit through the Plattsburg and Louisiana Maneuvers of 1939–1940, where he helped develop Army doctrine for armored and mechanized formations. In June 1940, Chaffee was appointed the Commander of the Armored Force, and given responsibility for integrating all branches of the Army into mechanized warfare. He played a major role in the development and fielding of new armored and mechanized infantry divisions for World War II. Chaffee was promoted to major general in October 1940, and given command of the I Armored Corps. He was stricken with cancer and died on August 22, 1941, at Boston, Massachusetts. He is buried next to his father in Section 3 of Arlington National Cemetery. Legacy The M24 Chaffee light tank is named after him. Fort Chaffee, near Fort Smith, Arkansas, is named in his honor. References External links Army.mil: Adna Chaffee Jr. ANC Explorer 1884 births 1941 deaths United States Army personnel of World War I United States Army Cavalry Branch personnel People from Junction City, Kansas Military personnel from Kansas Burials at Arlington National Cemetery Deaths from cancer in Massachusetts United States Army Command and General Staff College alumni United States Military Academy alumni Recipients of the Distinguished Service Medal (US Army) United States Army generals of World War II United States Army generals