So, the latest fad among the Qnuts as well as various assorted righties is using a black flag to signify that no quarter will be given.
Just as a note to the side, declaring that no quarter will be given is a war crime under international law (c.f. Rome Statue 8(b)(xii), and 8(e)(x) as well as Hague and Geneva Conventions), regardless if the armed conflict is internal or international.
So yeah, no national military that is signatory to the Conventions would carry around paraphernalia indicating preparedness to violate the conventions. And that’s assuming the black flags meaning is what some appear to believe it is.
And just to clarify, giving a “no quarter” order is a war crime under all circumstances, regardless if you are a militia or a national military force.

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