I'm curious, are the spartan suits removable, or are they cybernetically grafted to the people that wear them?
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They can all get out of the armor if they need to, and the ability to do minor field repairs. I'm sure some of the spartans had a more technical knowledge and could fix more complex parts but most of them had to rely on techs. If you mean the III's then yes, their armor is a more cost-effective variant of the original armor designed by Halsey.