The Boeing YC-14 was a twin enigne STOL (short take-off and landing) transport aircraft that completed in the USAF Advanced Medium STOL Transport (AMST), basically an attempt to replace the C-130. The YC-14 was competing against the YC-15 (which evolved into the C-17) in the AMST program, which we covered here.
The YC-14 is currently on display that the Pima Air and Space Museum. You can learn more about the YC-14 here.
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