Army of Two
Army of Two, commonly abbreviated as Ao2, is a video game developed by Electronic Arts, released on PlayStation 3 on March 4, 2008 in North America. Army of Two is a third person shooter game focusing on the fictional story of two private military contractors (characterized as mercenaries) "fight[ing] through war, political turmoil, and a conspiracy so vast it threatens the entire world" in a timeline spanning from 1993 to 2009.
Focusing on cooperative strategies, Army of Two's highlighting feature is the necessity to use coordinated teamwork to accomplish the game's goals. While the game is meant to be played with another human as your partner, a "Partner Artificial Intelligence"(PAI) is also included and programmed to follow the player's strategies in suit. Dependence on your partner (whether human or PAI) is so pronounced that most objectives are impossible to complete without it.
The story begins in 1993 in Somalia when Elliot Salem and Tyson Rios (the protagonists of the game) are still in the U.S. 75th Ranger Regiment. They are tasked to work with Philip Clyde, a private military contractor with the Security and Strategy Corporation (SSC), to carry out an assassination. After this mission, Philip Clyde, on behalf of SSC CEO Ernest Stockwell, invites Lieutenant Colonel Richard Dalton (commander of the 75th Ranger Regiment) to join the company for a desk job. He agrees, asking to bring Salem and Rios with him as contractors, and in the following year, the three enter the private sector. Salem and Rios begin work as mercenaries. Over the course of a decade and a half, they are caught up in a complex scheme to privatize the military, and see to the plot's downfall. At the game's epilogue, we see the two protagonists start their own firm — Trans World Operations, or TWO.