95. Boeing Model 400 XF8B
A familiar looking multi-purpose fighter concept, intended to fight the long war in the Pacific that the US knew would surely take place if the Japanese did not surrender. The XF8B was the largest piston powered fighter plane developed by the USA during the 1940s, and was so named for having 8 roles, 5 styles of bombing and 3 air superiority roles.
The large wings featured outer sections which could fold vertically, while the fuselage incorporated an internal bomb bay and large fuel tanks; more fuel could be carried externally. The proposed armament included six 0.50 inch (12.7 mm) machine guns or six 20 mm wing-mounted cannons, and a 6,400 lb (2,900 kg) bomb load or two 2,000 lb (900 kg) torpedoes. The final configuration was a large but streamlined design, featuring a bubble canopy, and a sturdy main undercarriage that folded into the wings.
It actually would probably have worked well if needed. Testing continued into 1947, but was cancelled in favour of jet designs.