Men of War: Vietnam makes a smart move when it comes down to the basics. It controls, plays, and basically looks just like its predecessors. So first and foremost, it’s a continuation of an already popular strategy series with a strong following that hasn’t touched the core elements of what makes it great. But by jumping into a new conflict and new era, Men of War: Vietnam plays up the elements of its war and brings in a real game changer: the jungle…