Good luck, just remember this:
You have built up your life, you have a loving family, parents and probably brothers or sisters, you've had some great moments in your life which you will never forget, you've been motivated to do the right thing, and I'm sure you think this is what's best for you.
But then, on the field, Taleban fighters are attacking your men, you and your squad panic and look for cover and a point to counter-attack. You sprint back to cover and just as you duck down and dive, bang, you're dead, you've left all your life behind within one second - just like that.
seeya!