In the Marine Corps, you are not allowed to give warning shots. In the army you can. You shoot to kill only.
There was a town in Afghanistan, the orders were that these people had a curfew at 5 pm. If man woman or child were outside after that time, you shoot them. (yes, even a child).
If you think we follow the ROE (rules of engagement) your mistaken. There are many ways around this. Our ROE's are much more relaxed than the army.
I know some old marines. They were literally told "you rape, kill, burn the people, there homes, you defeat their will to fight back." Kill everything. least funded, smallest, yet most effective fighting force in the United States military. They want you to be aggressive like an animal, a hungry one. They teach you to be that way. The sad part is when you come back, no one cares about this. It is a skill for one purpose only. No place in civilized society. Yet single mothers who dont even work get more help.
But the people were warned. Every house.
It's easy to kill and feel and feel nothing. One is just killing bodies, not people. It's easy to remove your emotions. People take for granted our civil societies.
It's harder to be civil an peaceful.
It's much harder to be a scientist, or engineer than it is to be a killer.