Karl Marlantes in “Unfinished Business”

Combat is like crack cocaine. It's an enormous high, but it has enormous costs. Any sane person would never do crack. Combat is like that. You're scared, you're terrified, you're miserable, but then the fighting starts, and suddenly everything is at stake, your life, your friend's lives. It's almost transcendence because you're no longer a person. You lose that sense, you're just the platoon, and the platoon can't be beat. And not to mention there's a savage joy in overcoming your enemy, just a savage joy. And I think we make a big mistake if we say, 'oh war is hell'. We all know the 'war is hell' story—it is—but there's an enormously exhilarating part of it.