or current ROEs in effect anywhere else. Here is my conditional premise:

... as I understand the traditional Laws of War ....
Our SROEs (by JCS) which I've seen (unclassified portion) - and posted about elsewhere - are based on "self-defense" principles from nation down to unit and individual. They are not what I would term the "traditional" Laws of War (e.g., as in the WWII context).

You do make a good point (which is also mine) - ROEs follow the choices made as to whether the Laws of War apply at all; and if so which rules from the Laws of War will be selected.