By Mark Naylor & Paul Greaves A thug has been jailed after a savage attack on a Royal Navy serviceman outside a nightclub. The victim was repeatedly punched by the drug-fuelled yob while trying to help a friend and has now lost his dream career, a court heard. He suffered “grave” injuries, including a broken wrist that later caused such serious problems that he had to be medically discharged from the Royal Navy. The abrupt ending of his Navy service shattered his hopes of a long career seeing the world and his life has changed “drastically” after the attack. James Rollinson, 32, from Hull, was…