How to think like a soldier?  I can’t teach you that.  A soldier needs to be strong in spirit, body, and technique – and the only one you can learn from someone else is technique.  In fact, technique doesn’t even matter.  What’s important is spirit.  Spirit and body are like two sides of a single coin.  They’re the same thing.  I can’t teach you how to think.  You’ll just have to figure it out for yourself.

Just because soldiers are on the same side right now, doesn’t mean they always will be.  Having personal feelings about your comrades is one of the worst sins you can commit.  Politics determine who you face on the battlefield.  And politics are a living thing.  They change along with the times.  Yesterday’s good might be tomorrows evil.

- MGS 3 Snake Eater - The Boss