Having just returned last month from a deployment to Afghanistan with much of that time spent as a Platoon Leader in Kandahar, I can tell you that no military force in history has been remotely as concerned with collateral damage, civilian casualties, and codifying escalation of force and ROE as the military is right now. I made it a point to review them and come up with scenarios with my Soldiers before every patrol or mission, but the fact of the matter is that you will inevitably run into situations not explicitly covered where a decision that could end someone's life has to be made in a tenth of a second. That's why its so important for values as well as specific rules be inculcated into the military, as my squadron commander liked to say, you will be right every time if you act within the Army values and with a nuanced understanding of the commander's intent.