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The Republic XF-103 was an American project to develop a powerful missile-armed interceptor aircraft capable of destroying Soviet bombers while flying at speeds as high as Mach 3. Despite a prolonged development, it never progressed past the mockup stage. :-)

BTW: very nice write-ups on your Century Series aircaft

@A Mentor - Thank you for your kind words and the additional info about the XF-103! Much appreciated.

@A Mentor.. I went and looked up the XF-103. Wow. That was quite the concept aircraft. Looked really Bad A$$ ! Thank's again for the tip. First time I ever heard of that one.