PEOPLE DIE. You have to prepare your body and your mind to participate in this virtual war. You must close off your empathy, and never give a second thought about the man who crumpled to the ground when you pull that trigger. It may seem heartless, but it's the only way to get through this thing alive. You have to kill him before he kills you.

If you keep that in the front of your mind, that this war is kill or be killed, you might just make it. And if you should die, it isn't the end. We will see you again, son. We'll see you again in approximately five seconds.

I am proud of you, son.

(this is not mine, somebody else made it)