Russians and Americans and British with guns.
[spoiler]Modern Warfare 3[/spoiler]
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You spend a few games going on a crusade against a religion blocking their path to ascending to god-hood, with the help of some fools who can't drive worth a damn, despite 4 games- and this crazy lass stuck inside your head telling you to kill, kill, kill and blow up fancy rings as a subtile hint that you should give her one- and finally she gives up- and angered by you- she kills herself in a 'splosion of blue.