The scenes are familiar enough to even the casual gamer: tanks rumble by, choppers pass overhead, exchanging gunfire with troops on the ground; explosions erupt left and right, revealing the grimacing faces of soldiers fighting a faceless enemy. But in the upcoming “Call of Duty: Modern Warfare 2/Infamy” one thing stands out: the gallant mansion reduced to rubble doesn’t belong to some crazed separatist dictator hellbent on all kinds of nefarious acts. Instead, it’s the White House. The scenes of post-apocalyptic scenes of carnage play out not in some fictional town in eastern Europe, but in Washington D.C. itself.