TGS 2008: Halo 3: ODST Trailer (a.k.a. Recon)

This 2009 first-person shooter casts you as "The Rookie," an ODST dropped into the ruined city of New Mombasa during the Covenant invasion to uncover the truth behind the attack and reunite with your squad. The core gameplay involves tactical urban combat and exploration. Distinctive features include the non-linear campaign structure and the introduction of the cooperative Firefight mode, where players defend against escalating waves of enemies, alongside access to the full suite of competitive multiplayer maps.