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150 ments as the basis for two combat teams, the division was to conduct reconnaissance, screening, and pursuit missions and exploit tactical situations. An armored infantry regiment, along with armored field artillery, quartermaster, and medical battalions and an ordnance company, supported the armored brigade. Similar to the German panzer division, it was to number 9,859 officers and enlisted men.

When approving the establishment of the Armored Force to oversee the organization and training of two mechanized divisions on 10 July 1940, Marshall also approved designating these units as "armored" divisions. Furthermore, he directed the chief of cavalry and the chief of infantry to make personnel who were experienced with tank and mechanized units available for assignment to the divisions. On 15 July, without approved tables of organization, Magruder organized the 1st Armored Division at Fort Knox from personnel and equipment of the 7th Cavalry Brigade and the 6th Infantry. Concurrently, Brig. Gen. Charles L. Scott, a former regimental commander in the 7th Cavalry Brigade, activated the 2d Armored Division at Fort Benning using men and materiel from the Provisional Tank Brigade. Marshall selected Chaffee to command the new Armored Force.

Four months later the War Department published tables of organization for the armored division (Chart 14). It resembled the unit developed during the summer, except that the engineer battalion was removed from the armored brigade and assigned to the division headquarters, and the ordnance company was expanded to a battalion. To the surprise of Chaffee, who had supervised the preparation of the tables, the authorized strength of the division rose from 9,859 to 12,697, including attached personnel.

The division fielded 381 tanks and 97 scout cars when all units were at war strength. Chaffee envisaged the establishment of corps-size units commanding both armored and motorized divisions, the latter essentially an infantry division with sufficient motor equipment to move all its personnel. On 15 July 1940 the War Department selected the 4th Division, which had recently been reactivated as part of the Regular Army's expansion, for this role. Collocated with the 2d Armored Division at Fort Benning, the 4th's divisional elements had earlier experimented with motorized infantry. Eventually the department published tables of organization for a motorized division that retained the triangular structure but fielded 2,700 motor vehicles including over 600 armored half-track personnel carriers.

Along with the reorganization and expansion of divisional forces, the Army increased unit manning levels and concentrated units for training. A peacetime draft, adopted on 16 September 1940, provided the men, and eventually the strength of all divisions neared war level. Prior to 1940 units were scattered over 130 posts, camps, and stations in the United States, but with mobilization Congress provided funds for new facilities. The Quartermaster Corps, during the winter of 1940–41, built accommodations for 1.4 million men, including divisional posts of the type constructed in World War I.