Jax, as he is known served as a faithful member of the military for 7 years, until an explosive accident occurred taking away his arms, and damaging other parts of his body. The military was kind enough to supply Jax with technological replacements without his consent, however they were unable to keep him in the service due to the learning curve he was having use these new enhancements. Feeling abandoned by an organization he trusted, he became a vigilante of the streets. He works with his buddy who still remains in the military, and provides him with equipment at a cost. At one point, Jax had a last name, but he felt it was overused in the military and got rid of it. During the military he took part in many field operations, and had earned the nickname The Twin Dragon as his pistols seemed to breathe fire when he shot. As such, he had a paint job done on his new arms, so they both resemble dragons, when the mouth being where he holds the gun. Im not sure what Jax actually does on the street, because Im not familiar with this world, but Im sure hes working to bring down the organization that operated the military responsible for mutilating his body and then leaving him to fend for himself.