From 1931 to 1935, Harris served as military attaché in Costa Rica. He was promoted to lieutenant colonel effective August 1, 1935. From June 1939 to October 1940, he headed the Latin American Section of the Military Intelligence Division on the War Department General Staff. From May 1941 to November 1941, Harris commanded the 47th Field Artillery Regiment. He received a temporary promotion to colonel on June 26, 1941, which was made permanent effective July 1, 1942.[6][7][8]
From April 1942 to July 1945, Harris served as military attaché in Mexico. He received a temporary promotion to brigadier general on March 14, 1943. After World War II, Harris served as military attaché in Argentina until March 1946. He was awarded the Legion of Merit for his service and returned to his permanent rank of colonel on June 30, 1946. Harris retired from active duty on April 30, 1948, and was advanced to brigadier general on the retired list on August 16, 1948.[3][8]
^ abc"Class of 1914—Register of Graduates". Official Register of the Officers and Cadets. United States Military Academy. 1971. p. 334. Retrieved September 24, 2022.
^The Howitzer. 1914. p. 163. Retrieved December 30, 2022.
^Official Army Register. Washington, D.C.: U.S. Government Printing Office. January 1, 1940. p. 343. Retrieved September 24, 2022.