Michael Yon calls it professionalism, but this is how General Petraeus articulates it in a letter to those under his command:
We are, indeed, warriors. We train to kill our enemies. We are engaged in combat, we must pursue the enemy relentlessly, and we must be violent at times. What sets us apart from our enemies in this fight, however, is how we behave. In everything we do, we must observe the standards and values that dictate that we treat noncombatants and detainees with dignity and respect.