It's no secret that first-person shooters -- in all their Hollywood-inspired clamor and spectacle -- don't simulate the realities of war very well. From basic rules of engagement, to gun safety (i.e., don't flag your buddies), and the dynamics of combat, FPSs are more akin to interactive action flicks than a proper recreation of armed conflict.
Wondering what to get that kid on your Christmas list? Wonder no more, the answer is easy. But warm up the credit cards -- it is going to put a massive dent in your finances.