Mattis is one of the finest Marines to ever walk the planet. I've known him personally, since 1978, when I was stationed at 1st Marine division, Camp Pendleton. He also resided across the river from me, in Richland, Wa. Do not discount this man's intelligence, knowledge, experience, or judgement. He is far superior to the likes of you and I trust him in the position he's in. General Mattis doesn't BS about anything.
Feel free to piss all over Trump, his cabinet, his family, or whatever. That you are free to do. I'll not stand for anyone maligning one of my fellow Marines, who has such a record of honor, integrity, service and competence. The appointment of General Mattis is one of the few things Trump got right.