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.

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.

When you're scared, you're still hanging on to life. When you're ready to die, you let it go. A sort of emptying out occurs, a giving up on the world that seems oddly familiar even if you've never done it before.

Sebastian Junger Quotes