Understandable, but wouldn't correct way to put it be: to rebel his chain? (Yank - Yankee) If you get my drift..
I get it, he can "Yank his own Chain," not going to Yank that one. But here it means take a joking shot at him in fun, he returns the favor believe me, the whole "Ex-Marine," part is his little devilish jab at me.
The LtCol here, the Marine Corps, would have been called "Mustang." The meaning is that he rose from the Enlisted Side of the House, not some Ste. Cyr or West Point Academy Grad.
Actually, when in dress uniform you can always tell a prior Enlisted Marine who became an Officer by looking to see if they display a Good Conduct Medal. Officers do not get Good Conduct Medals, only Enlisted after 3-years of good behavior. It is expected the Officers will always be well behaved, hence, no Good Conduct Medal.
So, Merry Christmas to all.