In April 1917, as the United States entered World War I, the Aviation Section of the U.S. Army Signal Corps had only a handful of usable flyingfields. This number quickly grew, ultimately exceeding 40 by the end of the war. Several uncompleted fields at the time of the Armistice were abandoned, and in the period between the world wars, the number of fields decreased more until only a relatively few were in use in 1939, when the country again began...
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History