He again went to sea in June 1920, as commanding officer of the Marine Detachment aboard (BB-43). From August 1922 (was promoted to major in January 1923) to May 1926, Schmidt was a member of the Marine Corps Schools at Quantico, Virginia, first as a student, then as an instructor. Then followed a year in recruiting at St. Paul, Minnesota, and a six-month tour of foreign service with the Sixth Regiment in China. From February 1928 to June 1929, Schmidt was with the Second Brigade of Marines in Nicaragua as brigade intelligence and operations officer.