The bravest of the brave were US tankers fighting in the pathetic Sherman tank.
the Sherman was a capable medium tank. It held it’s own against the German MK IVs. At the time the Sherman was designed the German MK V and MK VI did not exist. In Korea, the Sherman’s handled the Korean T-34/85s (could also attribute to crew quality)
Ditto the Brit tankers who bought it in tommy cookers.