in HALO 3 you are a Spartan and in HALO 3 ODST you are a Orbital Drop Strike Trooper (ODST)
Yes, Master chief is still in space with cortana in halo 3 odst he counts as a spartan and in multiplayer forge or any you and or friends are Spartans and when i played campaign i found a dead spartan on a building roof with a brute.
Yes, I think so. It won't be Halo 3 ODST but it will be about spartan 117.
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You unlock the odst armor by unlocking the UNSC SPARTAN achievement
No, firefight was not introduced until Halo ODST which was made after Halo 3. Only Halo ODST and Reach currently support it. Halo 4 will have a new game type called Spartan Ops which is similar.
In Halo 3, you play as the Master Chief, the last surviving super-soldier of the Spartan II group. In Halo 3: ODST, you play as an ODST instead of the Master Chief. There are also different weapons in ODST.
You have to get the spartan graduate achievement by playing on Xbox Live
halo3 odst is an expansion of halo3 the only big difference is that you no longer play as a Spartan you play as an odst.
I would say Halo 3 ODST
In Halo 3 you are a Spartan called Master Chief which is like a cyborg In ODST you are an Orbital Drop Shock Trooper dropped in a tube from space and you are a normal marine and your troop was scattered and you need to regroup-you do not see master chief at all
Halo 3 ODST is not for PC but Halo 1 and maybe Halo 2-3 are