Torture. In past wars, there have be soldiers in different colored uniforms shooting at each other.
In some cases, each side would take prisoners who were placed in prison camps and were treated in accordance with the Geneva Convention - in most cases. But, when your enemies are dressed like the civilian population, they become terrorists and should not be afforded the protections of the Convention. In fact, after watching the Twin Towers come down - where some people jumped to avoid the smoke and flames, and the rest getting crushed to death - you don't even want to know what I would do to make those terrorists talk.