Adam Driver has done quite well for himself in his second career. Driver was disappointed to find himself a civilian again just three years after he became a Marine after the Sept. 11 terrorist attacks. He was forced out of the Corps as a lance corporal following injuries he sustained during a mountain biking accident. But Driver’s post-Corps career has been anything but unsuccessful. He’s now a professional actor, with roles in “Girls” and the new “Star Wars” movie. He’s also appearing on the cover of the September edition of GQ magazine. In the cover story Driver, who was a mortarman with…