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Argus doesn't really use guns, he's basically bulletproof himself so he can just walk up to people and punch or claw at them.

Rost is trained with firearms but not super experienced, so Richard is probably the best bet given he has military experience from his time in Vietnam.

If it's just a matter of teaching experience, then Rost. Rost was a professor of archeology pre-BOSA, he spent most of his time working on archeology in the field but he did some college lecturing as well.