Jim Gordon is a BCSO Cadet. Badge #601.
There is a running joke that Jim will be a Cadet for his entire police career. His current situation is unknown, but it's likely we won't see a great deal of him due to feeling unappreciated by the BCSO and PD in general.
Only recently he has been seen partnering up with Senior Deputy Nicholas Riggs to get more of an idea of what it takes to become a Deputy, although as each day goes on his desire to become a fully fledged Deputy is becoming less and less desired.