if his anxiety is that much of an issue he wouldn't even get through meps. but now with recruiting crisis, i would imagine meps is signing off on anyone they can get. still, ait doesn't allow pets or any sorts (at least when i was in) nor does it allow family like wives/husbands/children. after you get assigned a station/base, then you're good to go.   you can get reclassed in wartime. look at your contract a little closer my boy. or ask coc or any officer on base. also > duty station of choice no. you get your station if they can have you. if not, they send you wherever depending on your "list". again, army prioritizes its needs over your wants. if they gotta deploy uou, or reclass you, or send you to another base, they'll do it.
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