when it comes to Modern Warfare and Modern Warfare II, there is a huge difference between the games story and Real Life.
An example would be the detonation of two nukes, 40.000 USMC casualties and the reinstatement of Soviet Russia...

Had it been the WWII parts of the CoD series, you'd only need to know about WWII to be able to beta read, however in this case, I need a beta reader how knows the characters and events of Modern Warfare and Modern Warfare II...