Face down in the dirt, with his hands held behind his back, Sgt. Maj. Russell Hull inched his body up a hill. It was around that time that he started to rethink the choices that led him to that moment. “That was miserable,” said Hull, who graduated from the Army’s Sapper Leader Course in the Spring. “There was a few minutes where I wanted to quit, because I was just like, ‘What am I doing? I’m 43 years old. I’ve been in the Army over 20 years. W…