Look Jun up on halo wiki. Turns out he trained the spartan 4s and maybe the 5s
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He -blam!-ing chose Palmer to be an S-IV... There are no SPARTAN-Vs yet. Far as we know. Although it wouldn't surprise me if they showed up in H5, they seem to introduce a new generation with every major game now. :/
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Oh I thought Locke was part of the 5s. My bad