If you know a lot about Halo, you will know what it is. If you don't, they are marines that are known for their toughness and occasionally cruelty. ODST stands for Orbital Drop Shock Trooper, and their nicknames are "Helljumpers". If you want to know more about the odst, go to halo.wikia.com/wiki/Odst. Anyway, you are an unamed odst solider who crashed in new mombasa in a pod. He is the only one left in his squad after the Prophet of Regret's slipspace jump devestaded the city and the ODST still conducting the drop. He is a Lance Corporal in the United Nations Space Command Marines. Since he is not as powerful(and not as badass:P) he doesn't have all the strength and equipment the master chief has and can do. So it is believed that you play more stealth-like. He/she's main weapon is a Supressed SMG with a red dot sight and a laser module. Only Bungie knows what the whole thing is all about. So for all I know, I could be wrong about everything! Now don't get too excited, after all, this is not a new halo game, just an expansion pack for Halo 3:):):):):):):):):):):):):):):):):):):):):):):):):):):P