What you might not know about him:
"Mattis is known for a singular focus on military history, tactics and strategy, traits that, along with his unmarried status, led to his Warrior Monk nickname. He is said to have a personal library of 7,000 books and during deployments often took with him “Meditations of Marcus Aurelius,” quotes from the Roman emperor and stoic philosopher. His Mad Dog nickname appears to be a reference to his combative nature on and off the battlefield.
When he was the head of Marine Corps Combat Development Command, Mattis co-wrote the counterinsurgency manual with his Army counterpart, Gen. David Petraeus. That manual became the guide for how the U.S. military operated in Iraq to successfully combat the Sunni insurgency."
-By LUIS MARTINEZ Dec 1, 2016, ABC News
A few famous quotes:
“Be polite, be professional but have a plan to kill everyone you meet."
"I’m going to plead with you, do not cross us. Because if you do, the survivors will write about what we do here for 10,000 years."
"No war is over until the enemy says it's over. We may think it over, we may declare it over, but in fact, the enemy gets a vote."
"You are part of the world's most feared and trusted force. Engage your brain before you engage your weapon."
"Find the enemy that wants to end this experiment (in American democracy) and kill every one of them until they’re so sick of the killing that they leave us and our freedoms intact."
"The first time you blow someone away is not an insignificant event. That said, there are some assholes in the world that just need to be shot."