Yes. I've personally known 2 of them. One who fought in Vietnam and another who fought in the War on Terror. The one who fought in Vietnam has a few chapters about him in the book 13 Cent Killers and worked with my mom at the post office (of all places). The other's son wrestles for me. I've had the opportunity to talk to both of them about their time as a sniper and the one thing they both really emphasize is that as a sniper, you can see the face of the person you're about to kill... and that takes a toll on you. Unless you're in hand to hand combat, most of the time you'll never see the face of the guy you're killing. It takes some serious internal fortitude to do that job.