Rob Bunce of OneLastContinue writes:
The United Nations Space Command is humanity's best chance in the war against the alien army known as the Covenant. They have trained an elite group of troopers known as the Orbital Drop Shock Troopers. These elite marines drop from a sub-orbital spacecraft to head up the front line in battle after crash landing spectacularly in their pods. In ODST's case, that crash landing puts them in the darkened streets of New Mombasa.