This letter General James Mattis wrote to his Marines is a must read in military history

Mad Dog is truly a warrior monk. Hopefully he will be given a waiver and be allowed to serve as SOD. If you are a serving officer and don't put winning battles and taking care of your people as your priorities prepare top be knife handed out of the service. As you should be.

one tough SOB...

I have that letter hanging in my office and have since he penned it (or shortly thereafter).