Petty Officer Second Class

Petty Officer Second Class is the fifth enlisted rank (E-5) of the UNSC Navy  and is a Non-commissioned officer. It is equal to Sergeant in the UNSC Marine Corps and UNSC Army, or Staff Sergeant in the UNSC Air Force. Directly above is Petty Officer First Class and Petty Officer Third Class is the rank directly below. This rank is given to all SPARTAN-II's upon graduation. This is most likely due to combat situations in which a Marine NCO has been neutralized, allowing an SPARTAN-II to take command of a squad.

In informal settings, Petty Officers Second Class are typically called 'Petty Officer'.

Known Personel.

 * Shiela Polaski
 * James-005
 * Li-008
 * Joshua-029
 * Vinh-030
 * Samuel-034
 * Isaac-039
 * William-043
 * Nicole-458
 * Anton-044
 * Linda-058
 * Malcolm-05
 * Kelly-087
 * Grace-093
 * Jerome-092
 * Douglas-042
 * Alice-130
 * Jai-006
 * Cassandra-075
 * Lucy-B091
 * Min-B174
 * Tom-B292
 * Adam-B004
 * Spartan-Jane
 * Spartan-Robert
 * Spartan-Shane
 * Spartan-Sheila

Air Force

 * Airman Basic
 * Airman
 * Airman First Class
 * Senior Airman
 * Staff Sergeant
 * Technical Sergeant
 * Master Sergeant
 * Senior Master Sergeant
 * Chief Master Sergeant
 * Command Chief Master Sergeant
 * Chief Master Sergeant of Air Force

Army

 * Private
 * Private First Class
 * Specialist
 * Corporal
 * Sergeant
 * Staff Sergeant
 * Sergeant First Class
 * Master Sergeant
 * First Sergeant
 * Sergeant-Major
 * Command Sergeant-Major
 * Sergeant Major of the Army

Marine Corps

 * Private
 * Private First Class
 * Lance Corporal
 * Corporal
 * Sergeant
 * Staff Sergeant
 * Gunnery Sergeant
 * Master Sergeant
 * First Sergeant
 * Master Gunnery Sergeant
 * Sergeant-Major
 * Sergeant-Major of the Marine Corps

Navy

 * Crewman Recruit
 * Crewman Apprentice
 * Crewman
 * 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
 * Force Master Chief Petty Officer
 * Fleet Master Chief Petty Officer
 * Master Chief Petty Officer of the Navy