They can survive as much as the shield and the titanium can basically, even re-entry to the atmosphere. Im pretty sure to use the G-25 or whatever airfoil carapiece, a spartan is launched from space, and then undergoes re-entry, and the sudden pull, of going from hundreds of MPH, to a much slower parachute fall, then the landing. I wonder how much the parafoil can take considering spartans weigh 1,000 pounds. I was actually thinkin of modelin the backpack thing the parafoil deploys from. its like 6 feet long.