infantry weapon- Tough one for me, since I collect these,and love them all. I would have to say the Walther P38 and MG34. Both these guns were awesome, and were very influential in future gun designs!

Tank- Hands down it has to be the Tiger tank! Not other tank even comes close. No other tank created such fear and respect! or has the "household" name of today as the Tiger!

Aircraft- This is another tough one! I would have to say the Me262 for fighters, and the B29 for bombers. Both these aircraft were amazingly effective, and both of them, quite litterally change the world!!

Naval- this is one is a no-brainer, Hands down the US Essex class Aircraft carrier! No Essex class carrier was ever sunk, and these ships took the war right to the heart of Japan, and destroyed it completely! When the US battleship fleet was laying at the bottom of Pearl Harbor it was the aircraft carrier that saved democracy. Even today the Aircraft carrier dominates the seas! Such an imposing weapon!

Matt