I have very personal experience of the Rules of Engagement as used by British forces (pull up a sandbag).
While I was out in Iraq on Op Telic (no number), I was involved in the first push from Kuwait into Iraq. I was serving with a field hospital and was part of the advance party that went forward first.
We had stopped at one point and were stagging on when an Arabic looking gentleman approached us holding a bundle in his arms. The two of us nearest raised our weapons and called out for him to stop and identify himself (in English IIRC - didn’t recall the correct Arabic phrase while my sphincter was trying to detach from the rest of my body!).
We followed the card correctly, if somewhat nervously, but he didn’t stop at this (funnily enough). At this point we both made ready and prepared to fire if he came any closer (at this point he was still some distance away). When he saw and heard us make ready, he stopped immediately and dropping to his knees he showed us his very young son who was very ill.
I suspect that under the ROE promulgated above here in this thread, both the father and son would now be dead.
As it happens, both father and son were fine after some medical care.
The threat of trained soldiers preparing to fire was enough to stop him in his tracks…
Edited for clarity