Halo 3: ODST.

About Halo 3: ODST

Halo 3: ODST is a 2009 first-person shooter video game developed by Bungie and published by Microsoft Game Studios. The fifth installment in the Halo franchise, it was released on the Xbox 360 in September 2009. Players assume the roles of United Nations Space Command Marines, known as "Orbital Drop Shock Troopers" or ODSTs, during and after the events of Halo 2 and before the events of Halo 3. In the game's campaign mode, players explore the ruined city of New Mombasa, to discover what happened to their missing teammates in the midst of the Covenant alien invasion of Earth. In the "Firefight" cooperative multiplayer option, players battle increasingly difficult waves of enemies to score points and survive as long as possible. The game also contains the entirety of Halo 3's multiplayer on a separate disc.