Aircraft
      by Nation
      United States
      Army (1909 -1918)
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      History
      1907: U.S. Army Signal Corps establishes the
      Aeronautical Division to take "charge of all matters pertaining to
      military ballooning, air machines, and all kindred subjects."
      1914: U.S. Army Signal Corps Aviation Section
      replaces the Aeronautical Division.
      1918: U.S. Army aviation is transferred from the
      Signal Corps to a newly created Air Service of the U.S. Army.
      Designations
      From the U.S. Army Signal Corps' purchase of their first
      heavier-than-air aircraft in 1909 through 1919, the U.S. Army used the
      different manufacturers' designations.