Aside from raising the body count to astronomical levels, there are other times that Rios and Salem need to work together to progress through the missions. Using co-op moves like step jumps, where one will give the other a boost up a ledge and then pull the other player up is commonplace through levels, as is having both players to activate switches or lift up doors.
Characters can also pull doors off vehicles they come across and use them as shields, where one player will shoot over the back of the other as they both slowly move toward their goal. Every once in a while, you and your partner will also need to perform a Back-to-Back maneuver that will put you, as the name implies, back to back as you both cover each other and slowly spin around as enemies attack you from all angles.
In addition to the single player and co-op campaigns, there is also a Versus Mode, that will allow players to play 2 vs. 2 online, but for most players, the co-op campaign is where it’s at and after completing the game once, it unlocks a harder difficulty for another arduous play through with unlocked weapons to give you a helping hand. Other than the controls of the weapons and poor aiming model, the great graphics and fantastic voice over work help make Army of Two a solid if unspectacular outing.