Are there any circumstances that would prompt you to volunteer to fight ISIS?

‘‘That was my first kill,’’ [Lawton] said. ‘‘Kinda weird, but I had a nightmare that night.’’
‘‘About the militant?’’ I asked.
‘‘It’s hard to explain,’’ he said. ‘‘You know these [ISIS] guys are animals, but even with that knowledge … ’’ He trailed off. ‘‘You know you have to let the brain figure it out on its own,’’ he said. ‘‘He pointed the R.P.G. at me. He would have taken me and my friend. It was hard for me. Killing people, you know you are here to do it. But then, when it happens, and you see it. It’s different. He just exploded.’’
We walked together up the road toward the village. Barley fields spread for miles all around us. ‘‘A couple days later, I was good,’’ he said. ‘‘Ever since then, it’s been no problem. I just have to remember the videos.’’
He meant the videos of Foley [being beheaded], of the Syrian soldiers [being summarily executed en masse]. He looked down and softened the earth with his boot. ‘‘See,’’ he said. ‘‘I have a big heart, and I never pictured myself actually doing it. I like to see the good in everybody.’’
http://www.nytimes.com/2015/10/04/magazine/meet-the-american-vigilantes-who-are-fighting-isis.html