The recent alleged killing of Afghanistan men, women and children by a U.S. Army sergeant not only brought back memories of my own combat experience, it also made me realize how I may have contributed to these killings. My combat experience and knowledge of history reveal that these events are not unusual and/or unique in a combat zone. If we are going to be involved in war, we should expect these events. What is unusual and unique is this soldier was serving his fourth tour of duty in a war zone. To meet our military obligations, we have become dependent on an all volunteer army, which has resulted in repeated tours.