These second duty deals are good, but what I've tried to explore here is the concept and the reality of medics who go armed and are in the thick of fighting in the USA (not in a war zone, on the streets or in a prison or similar).
I just don't see that it is a practicable paradigm.
I think such training is good so a medic going with the SWAT or similar team, but who is stationed a wee bit out of the way, knows what's happening, knows what NOT to do so she/he and the patient are safe, and in the extreme situation might be able to defend them....although it seems that doesn't happen either.
Authors and scientists have a saying about their work: "Kill your babies". Don't be afraid to discard paradigms proven wrong or happening as rarely as hens chewing steak.