Petty Officer

Petty Officer is a term used for non-commissioned officer ranks in the UNSC Navy.
*Petty Officer Third Class
*Petty Officer Second Class
*Petty Officer First Class
*Chief Petty Officer
*Senior Chief Petty Officer
*Master Chief Petty Officer
==Titles==
While the first three ranks are generally referred to as "Petty Officers," ranks from Chief Petty Officer and up are more correctly termed "Chiefs."