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| Stuff
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Aircraft
by Nation
United States
Army/Air Force (1924 - 1962)
Experimental: The U.S.
Army Air Corps used an X prefix to denote prototype versions of new
aircraft as early as 1925. It wasn't until 1947 that the new Air
Force began to use the designation X for special research aircraft.
Return to U.S.
Army/Air Force (1924 - 1962)
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page
updated 13 April 2003
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