Can not invite or join friends for Co-op and missing dlc

Actually, you have to 'invite' your friends for CO-OP, unlike ACE COMBAT: ASSUALT HORIZON with cool settin'! Sorry my friend, you have to friends of HALO WARS to joins in CO-OP MISSIONS-

I'm not seeing an option to host a random campaign co-op. Just blind? If you can host a co-op campaign game, it seems like there would be an option to join random games. Can you only invite people on your friends list to join your game? Same for Guerrilla
games. I don't are an option to search and host. Just friends?

I just got the DLC, so if anyone wants to play co-op send me an invite or a friend request.

Select "Co-op Campaign" from the Main Menu

Select Xbox LIVE

Select New Game

Choose your Difficulty

The game will hit a load screen at this point

Select Invite Friend

Choose Friend to invite

Start Game

It doesn't seem like this should be that difficult to be honest, what problems are you running into when trying to play a co-op game? You can also set your co-op game options to include Friendly Fire and only allow players on your friends list to be able
to join your game.

You can invite your friends into your campaign but there is no co-op matchmaking system for it other than in spartan ops.