About Mattis
http:// www.voltairenet.org/article204453.html
tl;dr : Mattis is a hero, Trump is a hero. They do not agree on a military point of view and respect each other. That's all.
Mattis tends to favor alliances (while he is absolutely OK with the US pullout from Syria and not being anymore the policeman worldwide, he cannot agree with Trump about destroying every alliances between the USA and other allies such as the EU and that's perfectly understandable) while Trump tends to favor its businessman point of view (aka cutting down useless subsidiaries) and its idea of nationalism. That's also a perfectly understandable point of view.
It seems Trump is REALLY going to kill NATO. He man has TITANIUM BALLS.
There is NO FUCKIN DOUBT about Mattis being a good guy.