Yes, I know what you are talking about - the concentration of all your thoughts in the moment, the rush of adrenalin, the profound peace of simply existing when you could be dead the next second.
Combine it with a belief in something, and you have most repeat soldiers.
But it's bullshit. It passes the minute you are hurt.
In Iraq, most of the repeat offenders are there for the money.
And then you have the sick ones; there have always been sick ones.
-Kostas Dervenis