You are a soldier in Iraq and out on patrol when you are attacked. During the firefight, a "woman" dressed in a burkha comes running towards you for help and two of your friends run out to help her. As they reach her she explodes, killing them all.
Another day, another patrol, another firefight, another woman running towards you. You have three seconds to either allow her in among you and your friends, or you can shoot her and risk going to Leavenworth for 20 years for killing a civilian, which is against the ROE.
What do you do? Remember, you don't have time to study this question. Three seconds.