The Grumman X-29
The American Airforce acquired the rights to the Grumman X-29 in the 80s. Its forward-facing wings were supposed to make it much more aerodynamic than any leading fighter jets. It was also designed to be extremely sleek, once again for the sake of aerodynamics. Ironically, all of these facets are why the Grumman never flew too well. It did not perform at all in the way that they wanted it to, so they scrapped the line.
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