One Shot - Lee Child

All cities are the same, and all cities are different. They all have colors.

Four types of people join the military. First, for people like me, it's a family trade. Second, there are patriots, eager to serve their country. Third, there are people who just need a job. And fourth, there are people who want to kill other people. The military is the only place where it's legal to do that.

It's never over.

Sleep when you can, because you never know when you're going to sleep again. That was the old army rule.

No harm, no foul.

One shot, one kill. That was the sniper's credo.

Rule one: Be on your feet and ready.
Rule two: Show them what they're messing with.
Rule three: Identify the ringleader.
Rule four: The ringleader is the one who moves first.
Rule five: Never back off.

True randomness is impossible for a human to achieve. There are always patterns.