Non-commissioned officer

A non-commissioned officer, usually abbreviated as NCO, and occasionally called "noncom"; is an enlisted member of the UNSC Defence Forces who has been given leadership authority by commissioned officers.

UNSC Navy NCO Ranks (From lowest to highest pay grades):
 * Petty Officer Third Class
 * Petty Officer Second Class
 * Petty Officer First Class
 * Chief Petty Officer
 * Senior Chief Petty Officer
 * Master Chief Petty Officer
 * Command Master Chief Petty Officer
 * Master Chief Petty Officer of the Navy

UNSC Marine Corps NCO Ranks (From lowest to highest pay grades):
 * Corporal
 * Sergeant
 * Staff Sergeant
 * Gunnery Sergeant
 * Master Sergeant/First Sergeant
 * Master Gunnery Sergeant/Sergeant Major
 * Sergeant Major of the Marine Corps

(Presumed) UNSC Army NCO Ranks (From lowest to highest pay grades):
 * Corporal
 * Sergeant
 * Staff Sergeant
 * Sergeant First Class
 * Master Sergeant/First Sergeant
 * Sergeant Major
 * Command Sergeant Major