It would be an interesting experiment for the US military to try stop killing people. It would mean that if you say had a bunch of ISIS guys going to kill civilians like they did in Iraq you'd have to find a non lethal way of stopping them like drones with tasers or maybe diplomacy / bribery. It would be an interesting tech challenge to make non lethal AI drones say that could stop a traditional military.
Or maybe like the non lethal terminator in Terminator 2 https://www.youtube.com/watch?v=i3XJxWwYx58