The story is told of Jim Mattis, when he was the commanding general at Quantico, relieving a young lance corporal on Christmas. The rest of that wintry day, those entering the front gate of the Marine base were startled to see that the sentry was a general, checking passes and waving cars through so that a young man could spend the holiday with his family. It is the kind of behavior animated by sentiments Donald Trump could not understand, and it reflected a kind of code by which he cannot live.
Source: Mattis Proved You Can’t Serve Both Trump and America – The Atlantic