uhhh got a question...
 

Does anyone know how to get a friend on to your gamertag so we can both play on the same screen? I have seen a couple people do it but when I ask them about it they don't reply to my messages. I have tried everything I could think of to do this but nothing seems to work. I wish it was easy to do like G.R.A.W. Anyone know how to do it?

you have to have multiple xbox (not live) accounts on your system, and when at the screen where you pick campaign, versus, ect. press Y select the secondary account and logg in, make sure both accounts are signed in. Then play.

So will that work on Xbox Live is is that only offline cause I have seen it done online.

yeah it works on XBL it will show up as yourtaghere, and yourtaghere(1);
and the tag with the (1) after it is your second player