Be careful with the way that agents spell out words phonetically.
It’s is clearest for everyone if during induction you train all advisors on the proper phonetic alphabet – A for Alpha, B for Bravo, etc.
If you don’t, you will find all sorts of “unofficial” phonetic alphabets coming into use.
While S is for Sugar may be fine, M is for Mickey could easily be confused with N is for Nicky. Even worse is the F is for Photo, which I recently heard.
For reference, here is the official Nato phonetic alphabet.
This should be taught to all advisors during induction. It can also be useful for refresher training sessions.