1 October 2018, the 81st RSC was officially reorganized as the 81st Readiness Division (USAR). History World War I The 81st Division was organized as a division of the United States Army in August 1917 during World War I at Camp Jackson, South Carolina. The division was originally organized with a small cadre of Regular Army, in addition to Officers Reserve Corps and National Army officers, while the soldiers were predominantly Selective Service men drawn from the southeastern states of Florida, North Carolina, and Tennessee. During October 1918, most of the enlisted men were transferred to other units, but additional drafts from Alabama, Florida, Georgia, North Carolina, South Carolina, and Tennessee replenished the strength of the division. After finishing training, the 81st Division, commanded by Major General Charles Justin Bailey, deployed to Europe, arriving on the Western Front in August 1918. Elements of the 81st Division first saw limited action by defending the St. Dié sector in September and early October. After relief of mission, the 81st Division was attached to the American First Army in preparation for the Meuse-Argonne Offensive. In the last days of World War I, the 81st Division attacked a portion of the German Army's defensive line on 9 November 1918, and remained engaged in combat operations until the Armistice with Germany at 1100 hours on 11 November 1918. The division sustained 461 casualties on the last day, 66 of them killed. After the cessation of hostilities, the 81st Division remained in France until May 1919; after which the division was shipped back to the United States and inactivated on 11 June 1919. Interwar period The division was reconstituted in the Organized Reserve on 24 June 1921 and assigned to the states of North Carolina and Tennessee. World War II The 81st Infantry Division was ordered into active military service for World War II in June 1942 at Camp Rucker, Alabama. As in World War I, the division was filled primarily with inducted men. The division trained at locations in Tennessee, Arizona and California before embarking for Hawaii in June 1944. After completion of amphibious and jungle training, the 81st Infantry Division departed for Guadalcanal in August 1944. There the division was attached to the III Marine Amphibious Corps reserve. In September 1944 the 321st and 322nd Infantry Regiment of the 81st Infantry Division performed a combat landing on Angaur Island as part of the operations