IC: WWII game?
That would depend on the kind of game you intend to play... A combat heavy, a more interpersonal one, etc...
A vechicle/craft crew would be, IMHO, to constained. An infantry (better yet comando) squad would have more opportunity for varied play.
As per setting, there are less known fronts taht could be interestin. In the PTO, to give some examples, there was not only the Island control combats, but places like the Eastern Duch Indies, or Burma front would give more freedom of movement. A Merrill's Marauders squad could be quite interesting, albeit it would begin quite late (they were activated in late 42, IIRC).
In Africa, you could even begin (if you intend the players to be Commonwealth) with Italina East Africa and then move o Desert war...
In ETO, many countries could allow for comando/partisan action (always interesting, more so if you don't intend it to be just combat heavy, but also to have interaction with locals, stealthy intell gathering, etc.). Player soulc begin as Norwegian tropos that turn partisans after the war, just to give an example...
The Easern Front would probably lead to a more combat heavy and brutal combat (aside from begining latter)
As per rules, Salvage WOrds could also serve, and even Twilight 2000 rules could e easily adapted 8after all, many WWII weapons are even described there). I guess many more games could do the job...