Comment by troyvit

I mostly agree with you, but I also agree with a parent comment that part of that gray area depends on who's side you're on. For instance:

https://en.wikipedia.org/wiki/1983_Beirut_barracks_bombings

That was a Marine barracks that was part of a "military peacekeeping operation". Granted, 128 non-military Americans were injured, but all of the dead people were military. The U.S. politicians labelled it terrorism.