In one of the missions, you're clearing a house that has civilians that are trying to defend themselves. One of the targets is a mother and her baby. The choice is there to shoot the unarmed woman, but if you pull the gun on the infant, you get a game over saying that "children are not combatants." If you continue from the checkpoint and still target the baby, the game will eventually say "WHAT IS WRONG WITH YOU?!" and the mission will end and you get kicked back to the select screen. ---