
Air Transport Command (ATC) is an United States Air Force unit that was created during World War II as the strategic airlift component of the United States Army Air Forces. It had two main missions, the first being the delivery of supplies and equipment between the United States and the overseas combat theaters; the second was the ferrying of airc...
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http://en.wikipedia.org/wiki/Air_Transport_Command

(from the article `flight, history of`) As a harbinger of things to come, the wartime achievements of the U.S. Army Air Force Air Transport Command (ATC) constituted a major step forward. ...
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http://www.britannica.com/eb/a-z/a/33
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