- Wolverfrog
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- Fabled Legendary Member
It is possible the Gamma company will be present during the battle of Reach; the group left Onyx shortly before the Sentinel attack there. However, it's unlikely as Bungie would have backstory to fill in for people who don't read the books; most Halo gamers don't even realise that the Master Chief is a Spartan II.
In all probability, we will play as a Spartan, not the Master Chief, but a new one from the second class of the IIs. It's also possible we will play as ODSTs, and Elites.
But I doubt Spartan IIIs.