I just want to let everyone know that the choice of class is merely a preference to what you want to play as. No class will hold a specific job as it relates to a fire team. This as been stated by bungie numerous times in numerous videos. So please pay attention and stop posting class requirements for raid teams.
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Won't know for certain till the game releases, goes for both sides though. All of it is just assumptions right now as with 90% of all forum posts here, assumptions.