It would be a cool option, but you'd sort of need your helmet for protection. You know, so you don't get your head blown off by a Fallen or so you actually have a HUD.
English
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well humans and awoken cant breath in space so that's why they need a helm.
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Space magic
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Exo really don't made of metal. Besides that we are talking about aesthetic toggle on helmets. When honestly I'm confused as to why a synthetic war machine would need a helmet with oxygen hoses for life support.