The leaders and soldiers  of NATO countries - and other friends and allies - demonstrate this truth through the capacity and courage they have shown in Afghanistan. But in many countries, there is a disconnect between the efforts of those who serve and the ambivalence of the broader public. I understand why war is not popular. But I also know this: the belief that peace is desirable is rarely enough to achieve it. Peace requires responsibility. Peace entails sacrifice. That is why NATO continues to be indispensable. That is why we  must strengthen UN and regional peacekeeping, and not leave the task to a few countries. That is why we honor those who return home from peacekeeping and training abroad to Oslo and Rome; to Ottawa and Sydney; to Dhaka and Kigali - we honor them not as makers of war, but as wagers of peace.