And each time the safety and effectiveness of the augmentations were improved upon. Spartan-IIIs got the same kinds of augmentations as the Spartan-IIs, but with a much higher survival rate. Probably the same situation as the Spartan-IVs, though I imagine not by much since it's only been a few years between the Spartan-IIIs and the Spartan-IVs, unlike with the Spartan-IIs and Spartan-IIIs.
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