The Gunner's Mate school is held at Naval Training Center Great Lakes, Illinois. The school was originally very hands-on. It is now primarily conducted through self-study computer-based training (CBT). The training focuses on the operation, maintenance, and troubleshooting of Naval guns, missile launchers, and torpedoes. It has a strong emphasis on basic explosives, guidance and tracking systems, small arms, Naval ammunition classification, and safety. Upon completion of this school enlisted members often continue on to a specialized school. At the specialized school they learn a particular weapons system.