Rules of engagement means that you are allowed to fire only if a, b or c happens. Sometimes an area is designated a free-fire zone where you can shoot anything that moves and sometimes you can only shoot someone that is armed. Personally I think calling in artillery on enemy combatants in a chowline or doing whatever would be fair game - whether they were armed or not. Basically, if they pose a threat to you then take them out.
It gets a little more difficult with a situation like, say the scene in Saving Private Ryan, where the squad runs up against the machine gun nests.
The squad votes to bypass the enemy as it has nothing to do with their mission - Miller decides to take them out.
[ June 28, 2002, 05:39 PM: Message edited by: charlie don't surf ]