You can only do split screen if the person you are playing with is with you.
Chat with our AI personalities
If you are the player hosting the match you can close the match, but if you are not hosting you can only stay or leave the match.
play in a private match
Gamemaster4474-- For a 25 kill streak in Modern Warfare 2, you get a Tactical Nuke, which once used, ends the match that you are currently in and counts your team as the win.
Im not exactly sure but I think you can go to Private match and change it there.
You must play a Search and Destroy Match and be the Last Man Standing on your team