Able Crewman 3rd Class, Able Crewman 2nd Class, Able Crewman 1st Class, Petty Officer, Chief Petty Officer, Master Chief Petty officer... And so on.
Berman didn't give a shit, but it's nice when O'Brien used to say "Don't call me sir! I work
for a living!"
In the modern military the ratio of enlisted personal to officers is 9:1, automation in the future has probably reduced that one sidedness of that division.