The Army Service Forces were a component that, in combination with the Army Air Forces and the Army Ground forces, made up the Army of the United States during World War II. Created on February 28, 1942, per an executive order titled “Reorganizing the Army and the War Department” from Franklin Delano Roosevelt, the Army Service Forces began recruitment and training via the ASF training program starting in March of 1942. Part of the necessity for the three-part organization of the Army came from the Chief of Staff, General George Marshall, who was overwhelmed by reports from over 61 agencies and officers reporting to him at once. He, in combination with the president, decided to then divide the Army into three components, thus only having three separate entities reporting to General Marshall at one time. The Army Service Forces were comprised of six different services: the Corps of Engineers, Signal Corps, Ordnance Department, Quartermaster Corps, Chemical Corps and Medical Corps. The ASF is believed to have had a part in the development of the atomic bomb known as the Manhattan Project in Oak Ridge, Tennessee, at the Oak Ridge National Laboratory.