We got a lot of neat stuff from WWII
national socialists had some pretty neat technology too, with their stealth bomber ideas, Japan had some special folding plane thing that the Americans stole, America also had the m1 garand which was p cool, Britan I think had some silenced pistol and dont forget the whole SAS organization, and Russia had well...
RUSSIAN STRONK.

What else am I missing?
Flamethrowers?
PS. I'm not to bright on historical weapons.