If you look at the Law of Armed Conflict (and I don't think it's changed since I studied it) the right of self-defense of a military unit is absolute, and obviates any Rules of Engagement that may have been tacked on locally.
If you're taking fire, whoever is firing has agreed in advance that it's OK for your unit to return fire.
That's not quite the same thing at the individual level, especially looking worldwide.
However, anyone interested in legislating all that away should, in my opinion, check their privilege, apply their law to themselves, and doff their security details.
I'm guessing that would sober up a few of these [gerund] [noun]s.
