Operational Training Units (OTU) and Replacement Training Units (RTU) were training organizations of the United States Army Air Forces during World War II. Unlike the schools of the Army Air Forces Training Command (AAFTC), OTU-RTU units were operational units of the four domestic numbered air forces along with I Troop Carrier Command and Air Transport Command, 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.
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