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A group of BT-13 Valiants from Vance Air Force Base, Okla. soar over Northwest Oklahoma in the early 1940s. The BT-13 Valiant served almost exclusively as the basic trainer for all aircrews trained in the U.S. during World War II. By 1945, the aircraft was being replaced with other advanced models and after the war the aircraft was retired. (Courtesy Photo)
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