Under the National Defense Act of 1920, the 39th Division was allotted to Alabama, Arkansas, Florida, Louisiana, and Mississippi, part of IV Corps, in 1921. On 1 July 1923 it was reorganized, less the Arkansas units, and renamed the 31st Division, following the recommendations of a joint board of Regular and Guard officers, due to its allocation to states which raised the 31st Division in World War I. In August 1924, the division, except for the 124th Infantry, conducted squad and platoon level training at Camp McClellan, its designated mobilization training center, due to its troops being relatively inexperienced. Its headquarters was organized and Federally recognized on 15 October of that year, stationed at St. Augustine, Florida, under the command of Major General Albert H. Blanding of Florida. During the interwar period, the division was organized in accordance with a square organization similar to its World War I structure, although a separate headquarters for Special Troops (Military Police, Signals, Ordnance, and Armor) was created and medical and quartermaster regiments added.