Hey there guys.
I’ve been wondering for a while, what order will the co-op characters be?
If P1=Master Chief/Locke, then what player (2, 3, 4) will you have to be if you wanted to play as, say, Fred?
Or will you be able to choose?
It’s been confirmed already that when playing co-op all secondary players will get to choose which other Spartan on each respective team they want to play as. That way you can just pick your favorite character, or the one whose weapon loadout suits your preferred play style. Pretty cool, huh? 
Sweet, that helps alot. Thnx!