There is a WW2 game that is kinda a mix b/t an RTS and a FPS called Soldiers: Heroes of World War 2 by CodeMasters.
It's fun but takes a good comp to use.
U cant build units BUT u can jack tanks, change every soldier's gun and pick up ones off the ground, use ur own tanks, shoot ur all ur soldiers in a sort of FPS way (Except ur looking down and aim w/ a little dot that has rangefinder and stuff).
and the best part is is that the world is COMPLETLY DESTRUCTABLE!!!!!!!!!!!!!!!!!!!!!
:D :D :D :D :D :D :D
The buildings u shoot dont have a health bar, they can fall apart in pieces or as a whole, depending on where u shoot em.
The tanks all have different weak spots and are invincible to HE shells, but AP is good. AP rounds dont do much against buildings (they go straight through, meaning no tank can hide... :) ) and inf (hard to hit dead on). There is body armor and stuff too. Some of the guns include the Mauzer, Thompson, M1 Garand, ect.
U get to be either America (Sherman) Britain (no clue, havn't used them) Russia(The good ol' T34) or Germany (The Panzer IV and The Tiger)
there are some armored cars, some other light tanks, and the Strummel.
Grenades are hard to use, BUT u get Cocktail Moltovs which makes it all better.
Great game!!
U can get a SP demo here: http://www.gamershell.com/download_6016.shtml