The Japs were basically amped-up N. Vietrnames and N. Koreans.
They fough sneaky and didnt have signature uniforms like the Germans did.
Both the US and the Soviets had cool looking uniforms - but the Germans were the best . The Brits sucked - no insignias and had World War 1 era pie-plattter helmets.
The US military basically copied the Germans helmets when they ditched the pot-helmuts in the mid 1980s - which they used from 1941 to the mid 80s.
Before they used the Brit-style pie-platter which protects nothing.............
I agree that the old British helmets were pretty awful.
But now they can thank the US Military for 5.56mm rounds that aren't effective. Oh how useful to have a standard Nato caliber; but when you need 7.62mm as a killing round against enemy that aren't terribly worried about medivac....