How does famous Marine drill instructor pass time on a long flight?

Former Marine sergeant R. Lee Ermey is best known for his role as a strict drill instructor in Full Metal Jacket and, most recently, as an unsympathetic shrink screaming at his "jackwagon" patient in a GEICO commercial:

So how does this tough-talking Marine unwind on a long flight? He apparently likes to knit:

h/t to Ace who notes:

R. Lee isn't afraid of anything - even learning how to knit in public. And before you snicker - just remember that he knows at least 8 different ways to kill you with the yarn and needles alone.

(Click here to see what R. Lee thinks of the state of our country)