Help me understand: In the game you need to kill, capture, or otherwise remove a character named "Wolf".
And there is some key press combination for doing so versus actually playing the game and removing the character/player.
My suggestion.
Go to the Call of Duty community:
https://www.callofduty.com/modernwarfare/campaign
Post your question therein. If other players have no problem with responding - so be it.
However, if anyone else who plays Call of Duty responds with a post that you are looking for some cheat - then this/your post herein will be closed.
Please clarify and explain accordingly.