How can the marines take their helmets off on Char?

Before landing on Char, General Warfield says that Char has "an atmosphere that will burn a man alive;" however, during the cinematics, the marines are shown without their helmets and there doesn't appear to be any sort of shielding on their platform. How is this possible?
Best Answer
Ender is right - there is no in-game reason for this.
This is just the rule of cool. Extremely hostile environments are cool - only real heroes may prevail there. Speaking to each other from behind closed helmets is uncool - the player can't see character's dramatic expressions.
Conflict? No, why? :-)
See also: how a normal human (not the ripped Tychus) can fit into a CNC, why does Raynor have two revolvers - a human-sized and a CNC-sized one, etc. etc.
It's just that the story of SC2 is not exactly thoroughly written, we all have to deal with it.
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