"In 2004 in Fallujah, we were involved in so many direct fire engagements. We made eye contact with the enemy. And we lost guys. That was a totally different experience, losing someone that way. You automatically had to address Okay, not only did that just happen, but someone made this happen. That person is still here. House fighting, especially in an urban environment, the sense you most rely on- hearing- is gone. You devolve into an almost animalistic being. Like, I'm smelling this guy. I see a pristine drinking cup on the counter and everything else is covered in dust and grime. A piece of cheese sits on a plate. There's a person here. You become a wolf- just sniffing the air and smelling. Everything stops. Your whole body freezes. You don't breathe. You don't think. All you do is become a single, focused thought: There's a threat here and it needs to be put down."