Indeed, apparently you even have a 90-minute oxygen supply.
Chief's cloak: Provides decent visual camo, might help keep sand out of his armor-it is airtight but John probably notes it as a side benefit if it's true, if not I'm*sigh*incorrect, although his visor seems damaged but it is just a trailer meant to get us hyped up-AND makes him look like a badass in priority of importance, and it's not one of those poser looks! (No offense intended).