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Reference.org
Operational - Replacement Training Units
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<p>Operational Training Units (OTU) and Replacement Training Units (RTU) were training organizations of the <a href="/facts/United_States_Army_Air_Forces/0mtva6Cw">United States Army Air Forces</a> during <a href="/facts/World_War_II/2efV5L1U">World War II</a>. Unlike the schools of the <a href="/facts/Army_Air_Forces_Training_Command/f8Uja37B">Army Air Forces Training Command</a> (AAFTC), OTU-RTU units were operational units of the four domestic numbered air forces along with <a href="/facts/I_Troop_Carrier_Command/D7FpmjjG">I Troop Carrier Command</a> and <a href="/facts/Air_Transport_Command/bB5nQEuu">Air Transport Command</a>, with the mission of final phase training new pilots or crews. Most were disbanded in the spring of 1944 and replaced by combat crew replacement centers assigned to base units. </p>