[@Thecrash20]

Actually yes, in the book it is implied that the suits are the reason they're called mobile infantry.

They also have enough strength on their own to punch through concrete walls and crush a tank, their armory was never discussed, however it was mentioned in the book that they have Micro-Nuclear Warheads, they also had flamers, and since we don't have a full armory, we can assume that they have that much firepower, at least the marauder and command variants anyways.