Sebastian Junger — American Author born on January 17, 1962,

Sebastian Junger is an American journalist, most famous for the best-selling book The Perfect Storm: A True Story of Men Against the Sea, his award-winning chronicle of the war in Afghanistan in the documentary films Restrepo, Korengal, and his book War... (wikipedia)

The combat environment has the effect of flattening out civilian identities. If you're young or old, or a graduate from Harvard or the son of a farmer from Alabama, or if you're gay or straight or good-looking or ugly: none of those things matters much in combat, as long as you can conform to the group expectations.
The only thing that makes battle psychologically tolerable is the brotherhood among soldiers. You need each other to get by.
Of the primary emotions, fear is the one that bears most directly on survival. Children show fear. Adults try not to, maybe because it's shameful, or, in some circumstances, dangerous. The fear response is automatic, though, and your body runs through its reflexes whether you want it to or not.
I have been working since I was 20, and I'm 38. I actually once averaged out what I had made over my professional life. I think I could have made that much as a waiter or an insurance salesman. You know, I spent so many years in my 20's making $10,000 a year.
No matter how many people you kill, using a machine gun in battle is not a war crime because it does not cause unnecessary suffering; it simply performs its job horrifyingly well.