Following his return to the United States, Harries was commissioned as a brigadier general in the Organized Reserve Corps. After the war, Harries served on a board of general officers which reviewed the qualifications of the Army's majors, lieutenant colonels, and colonels to determine which would be retained in the service during its post-war personnel reductions. He was subsequently promoted to major general in the Auxiliary Officer Reserve Corps, and he served until reaching the mandatory retirement age of 64 in 1924.
