For some reason, I hadn't watched this until now. Very disturbing and human.
As I was watching, listening to him talk about the man-to-man fighting, I was thinking about how today's conflicts have become, in a sense, like video games. He addresses the same point at the end of the interview, how bombs, and shooting at a distance are impersonal. Yet, when you stab another man in the heart and watch him die, blood coming from his mouth, it's quite a different thing.
However, I recall reading some stories about drone "pilots" who have a similar reaction - though impersonal, that kind of warfare takes its toll as well.