The U.S. training program produced more than 10,000 pilots as new first lieutenants in the Signal Officers Reserve Corps (S.O.R.C.). 8,688 received ratings of Reserve Military Aviator in the United States and were assigned to newly created squadrons or as instructors. 1,609 more were commissioned in Europe, with their commissions backdated in February and March 1918 to those of their peers trained in the United States. Pilots in Europe completed an advanced phase in which they received specialized training in pursuit, bombing, or observation at Air Service schools acquired from the French at Issoudun, Clermont-Ferrand, and Tours, respectively.