Sorry mate, what you've got there are First Person Shooters.
A shoot 'em up would be something like RType or Ikaruga.
There's quite a few Medal of Honor games and Call of Dutys, I couldn't attest to their quality though. According to Play.com there's Medal of Honor: Vanguard, Rising Sun and European Assault; and Call of Duty: Finest Hour, 2 and 3.
Those two franchises pretty much have the monopoly on World War 2 based FPS' .
That's the limit of my knowledge I'm afraid, I try and avoid FPS' on my PS2 as I just can't play these type of games without a mouse.