They should have you play as a squad of Americans, where you start the game right out of training camp and fight your first battle together from the beginning. You get to know everyone, their backstory, their ambitions, their views on the war and all that shit. Just make good characters that you're happy to be fighting aside and want to protect. Then, make the final mission have you take the part of a German sniper who is guarding some place that the squad is attacking, and the only way to beat the game is to kill everyone.