CORRECTION: The F5A/B were not 'Tigers'. they were 'Freedom Fighters'. The F5C, used by the USAF in Vietnam, was the 'Skoshi Tiger', which led on to the F5E being called the 'Tiger II'. My bad.
Still a controversial fighter, the Northrop F20 had it all on paper at least.
An extremely capable aircraft, built to a US government specification, it could have been a one of the world's primary fighter aircraft even today.
But the vagaries of government policy and various machinations means that the F20 never made it making it possibly the biggest "whatif?" fighter in history.
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