You need the will to win. You need to do what needs to be done. And it can be nasty. We really do not. Is it a war or is it a police action? Anyway using the most advance weapons including WMD's will end the enemy. We in every way were better then the enemy in the Viet Nam conflict. But we still left without a clear cut victory. We did not have the will. so we did not go to the limit against them. They won...and lost by doing it.