Players will join up with either the game's lifelike built-in Partner Artificial Intelligence (PAI) or other players "to fight through war, political turmoil and a conspiracy so vast it threatens the entire world."

The game involves conflicts with private military corporations, as you play as Tyson Rios and Elliot Salem, two "contractors" in a private military corporation (PMC), a company hired as security or to supplement government military forces. You choose one character at the start of each mission; the computer or a second human player controls the other character. The game will feature a unique weapon upgrading system, where just about any part of any gun can be combined.

Both players wear ballistic facemasks, which protect them from bullets, gun-fire and debris. Salem's facemask bears skull-like teeth, and Rio's mask possesses large flames. One of the major gameplay angles, which sets AoT apart from most others, is that nearly every aspect of the game is co-operative. Even such activities as parachuting, rapelling and even death are all played co-operatively.

Everything in Army of Two, from the environments to its physics to its small army of enemies (up to 50 on screen at once) has been designed to force you to work with your partner.

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