Yes. This is the game that started combat training. If you are asking with how many people you can play with up to four people if three of the have Xbox live profiles.
Combat training is online only
You can't
Go to multiplayer like usual, then click Combat Training.
I don't think you can, but you can exit combat training and start it again.
You Cant
no
no unless u mod it
50. There is not Prestiging.
yes u can
You can do Zombies, Combat Training, or Normal Versus (with Killstreaks etc.)
This is for Xbox 360&PS3 you have to be signed into Xbox LIVE or PSN for it to work otherwise you cannot get Combat Training.
Go to multiplayer. then when you click on that go to combat training, only works if you have xbox LIVE/playstation network