Congrats on the new ticket. My old call suffix was HMI -- which I often said I was glad it was not HMH (one of the shops I deliver to is called HMH), although I do know HMH and we would greet each other as "H" and "I". The other day I was looking up where the calls in the Zero call was the other day, and they are in the KD0PU's -- like PUB, PUC, PUD, PUK, PUN, PUP(already getting HV), PUR, PUT, PUU (they stop a X). I am not sure if I would want to be a PUD or a PUK though.
If you want, you can always get a vanity call, but since you are a fire fighter, you are often "wet". (Being fire buff I have several stories of FF that I knew and how they got "wet" like falling into two pools in the middle of winter...)