From what I’ve been reading, turns out he wasn’t even an armorer as first reported.
Former members of his unit are coming out now stating that he was a mechanic or some type of support guy and never ever left the confines of where he was assigned.
Its sad that the guys that actually need and deserve the benefits for things like PTSD, have it watered down by POS’s like this a**hole.
It's possible that the guy wasn't even mental. Maybe they asked him about what he did in the military and made fun of the BS he spouted. Whereupon he waited until their backs were turned and unloaded on them. All out of wounded pride (and maybe substance abuse).