Halo 3: ODST (originally Halo 3: Recon) is a first-person shooter video game developed by Bungie and published by Microsoft. It was released on the Xbox 360 video game console on September 22, 2009. Players assume the roles of elite human United Nations Space Command soldiers known as "Orbital Drop Shock Troopers" or ODSTs during the events of Halo 2 and 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 an alien Covenant invasion.