Or was chief the only Spartan that had one?
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Well the AI itself isn't implanted into the brain, the mjolnir suit acts as a middleman. But yes every spartan can do that. Also MC wasn't ever issued Cortana, he was just supposed to stop her from being captured in Halo 1. They don't ever explain why he was allowed to just keep her and keep running around with her. I guess he is just that awesome.
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From the Books nope no one evr had one
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They all had that ability, but I think chief was the only one that actually used it.
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Black Team.
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All Spartans wearing Mk. V - VII have the ability to integrate with an AI. Naomi is an example.