Its a good pick War is horrific. Some who post here have probably seen that first hand. Mattis has seen young men blown in half. You don't forget that. Trump may be a loose cannon... but I'm glad he picked a man that knows the atrocities of actual combat. Peace through strength. Negotiate anything. Anything but war. For real... its the only way. A 4 star Marine knows whats up. Chalk one up for Trumpy.
And that being said... I would not want to be in ISIS. Cause those F'rs are gonna all be dead this time next year.