As a soldier, you are taught to respond to an order in a split second, if you receive a command and ignore it or suggest it may be illegal then the consequences will be far greater than carrying out the order. You don't question orders unless it is something so blatantly obvious that it is illegal,. Being briefed before going into a fight is one thing, that is a tick box excercise for the military to shift the blame onto you in the event it goes t***s up.