This is intructor Patstone from the US NAVY Seals.
I saw a Discovery Channel documentary about the training course of the Seals and he was one of the drill-instructors.
I can recommend you the documentary. It was very impressive. I had a lot of respect for the recruits. [link]
Anyway, I was bored on my vacation and I decided to draw Patstone.
HB, 2H, 2B pencils
around 3 hrs