as a mountain division was retained, and after completing training it served in combat in the Italian mountains. Overall, the Army's wartime division organization and reorganizations have been judged a success by historians, in that they provided an adequate number of units to win the war, while ensuring that agricultural and industrial production could continue. Individual replacement system As AGF commander, McNair worked to solve the problem of how to integrate replacement soldiers into units that had sustained casualties. Rather than adopt the model of replacing units that had sustained high casualties with new, full strength units, Marshall and McNair cited the need to allocate space on transport ships to equipment and supplies as the reason to provide individual replacement soldiers to units while the units remained in combat. In practice, the individual replacement system caused difficulties for both the replacement soldiers and the units they joined, especially during later stages of the war. New soldiers could have difficulty being accepted by the veterans of their units, since they were replacing buddies who had been killed or wounded, and had not shared the veterans' combat experiences. In addition, because new soldiers joined units that were already in the fight, there was often no time to teach them the tactics and techniques that increased their chances of surviving on the battlefield. Though soldiers were supposed to be allocated to requesting units from replacement depots based on their qualifications and the priority of the unit, McNair found that in practice many commanders in the combat theaters used replacement soldiers to form new units, or personally selected individual replacements from personnel centers without regard to their qualifications. Assigning soldiers to units for which they were not qualified, such as armor crewmen to infantry units, negated the training they had received before going overseas. To address these concerns, McNair advocated faster qualification of replacement soldiers by reducing their training from 24 weeks to 13. The War Department reduced the training requirement to 17 weeks, but mandated continued use of the individual replacement system. Because the AGF had responsibility for implementing the individual replacement system, McNair attempted improvements, including directing the establishment of the Classification and Replacement Division within his command, and streamlining the physical, psychological, and mental criteria used to determine fitness for service. Issues with the ASF's management of replacement centers within the United States led AGF to establish two new ones at