of Chevalier. The citation for his Army DSM reads: Between the wars Upon returning to the United States in May 1919, Simpson was posted to the 6th Division at Camp Grant, Illinois, as its chief of staff from June 15, 1919, to August 25, 1920. He reverted to his substantive rank of captain on June 30, 1920, but was promoted to major again the following day. From August 26 to December 30, he served as its assistant chief of staff (G-3). He served in Washington, DC, in the Office of the Chief of Infantry from January 1, 1921, to August 1, 1923. In El Paso, Texas on Christmas Eve, 1921, he married Ruth Krakauer, an English-born widow whom he had first met while at West Point. From September 1, 1923, to May 28, 1924, he was a student officer in the Advanced Course at the Infantry School at Fort Benning, Georgia. He then attended the United States Army Command and General Staff College at Fort Leavenworth, Kansas, from August 15, 1924, to June 19, 1925, when he was graduated as a distinguished graduate. On July 1, 1925, Simpson assumed command of the 3rd Battalion, 12th Infantry Regiment, at Camp Meade, Maryland, and later Fort Washington, Maryland; his tour in command also included duty at the Sesquicentennial Exposition in Philadelphia from May to November 1926. He then attended the United States Army War College from August 15, 1927, to June 30, 1928. Upon graduation, he was assigned to the War Department General Staff in Washington, DC, where he worked in the Latin American section of the G-2 branch. On June 20, 1932, he became Professor of Military Science and Tactics at Pomona College in Claremont, California, and was promoted to lieutenant colonel again from October 1, 1934. This posting also included duty as the Army representative at the California Pacific International Exposition in 1935. He then became an instructor at the Army War College in the G-4 Division from August 12, 1936, to June 24, 1937, and was director of its G-2 Division until August 25, 1940, with the rank of colonel from September 1, 1938. World War II On August 30, 1940, Simpson was appointed to command the 9th Infantry Regiment at Fort Sam Houston, Texas. He was promoted to brigadier general on October 1, 1940, and served as the Assistant Division Commander (ADC) of the 2nd Infantry Division from