Having served (and killed for) my country in areas of combat, I know that I could (and have) kill another human being. It never gets easier with time or the more you kill, but i can say that distance makes all the difference. Tipping the turban (forgive me for what we called it) from 1000 yards with a Barret 50 cal is a lot easier than having to slip a cord over their head and twisting yourself so they squirm on your back with their feet thrashing in the air. You literally feel the life leaving their body (p.s. sometimes if your not lucky, they shit all over your back). I once wrote a post on what it feels like to kill, and you can check it out, I believe the thread was "Have you ever killed someone?" Let me finish by saying, if you aren't face to face, and they aren't right in front of you, you can distance yourself and your mentality from them and from the task at hand. If not it matters little, you will live even when they do not. It helps to talk to someone who has shared these experiences and they will be able to help you in ways that friends and family may never understand.