Marines love Gen. James Mattis so much that there’s even a special Christmas tale about the “warrior monk” that makes the rounds on the Internet each holiday season. As the story goes, Mattis stepped in for a young Marine who had guard duty at Marine Corps Combat Development Command in Quantico, Va., on Christmas Eve back in 1998. Mattis — then a one-star — is rumored to have told the Marine on duty to go home and spend the holiday with his family. Mattis took over and spent the night pulling guard duty. Now, we know Marines love Mattis. We’ve seen…