If you're talking about PC: Within Steam, in the My Games tab, right-click the game and choose "Delete local content". Should keep your game saves but remove the game itself.
For xbox you go to your hard drive and delete the game. This isn't very detailed but just go to your hard drive and it is pretty self explanatory from there.
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well call of duty and modern warfare are the same it is called Call of Duty: Modern warfare and then came call of duty: modern warfare 2
Call of Duty classic Call of Duty 4 Modern Warfare Call of Duty World at War Call of Duty Modern Warfare 2 call of duty black ops call of duty modern warfare 3
"Call of Duty 6" "MW2" "Modern Warfare"
It's not available for the Modern warfare series of call of duty
The game that is being called Call of Duty 6 is Call of Duty Modern Warfare 2 or MW2