The name of the game in Army of Two is co-op. Whether you play on or offline with a friend or use the game's A.I. teammate to assist you, it's all about two-man strategies. The game is setup in such a way that trying to do things all on your own will be next to if not completely impossible. So if you have notions of playing as Rios and just telling Salem to hold position while you kick-butt, think again.