It's hilarious how some of you are fearful enough of big bad MCs to hand out unsolicited warnings about getting your ass kicked by patched bikers as if that's an everyday occurrence, but simultaneously bemoan the terrible, terrible influence of "snowflakes" on society. That schtick is more than a little tired at this point.
I'm neither a snowflake nor afraid of bikers, but "stay back or you might get shot" seems likely to be misinterpreted by many, whether they be snowflakes or tough guys in brodozers looking for some shit. Sure, if they see both sides of the vest it becomes clearer, and adding "it's ok, this is about the military" somehow may help—but an asshole driver having a bad day (more of a material danger than scary bikers, assuming one actually rides) may take it as an invitation to mess with you.
But I'm more chuckling at the oh-so-enlightened commentary than your potential patch. Carry on.