The current trajectory of the military is one of the major reasons I voted for Trump -- I thought 4 or 8 eight more years of social engineering might do damage that could never be undone.
The nomination of Mattis would be the absolute best sign possible that this era of SJW running the military would end. Mattis would be not just a home run, but a grand slam, bottom of the ninth, 7th game of the World Series-type home run.
Don't know that he'll get it, but the mere fact that Trump seems to like him so much is extraordinarily encouraging. And I say that as someone who has friends of senior rank in the Marine Corps.