I guy I went to school with is a JAG officer. Did some interesting work in 'ghanistan, primarily rules of engagement work.
He had the authority to cancel airstrikes, for example, if it was determined to be outside the ROE ie, non-combatants amongst target people or structures.
I see their utility in such circumstances, particularly in this day and age when the armed forces are under such public scrutiny.
I see their utility as well in the circumstances you mention, but the story discussed operations in Fallujah in particular.
It seems to me that a lawyer will err on the side of "international law", while the military commander would make a decision based on the well being of his troops.
I wonder what kind of reprocussions face one of these lawyers who makes the wrong call and gets our boys killed?