The discussion over the best military aircraft to never get into service has more candidates than I can actually recall. But right up there must be the Grumman F11F1F Super Tiger.
Recommended reading on the subject:
Grumman's Mach2 International F11F1F Super Tiger by “Corky” Meyer https://amzn.to/3dh05Pl
Sources for this video can be found at the relevant article on:
https://militarymatters.online/
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