[1] Petty Officer Second Class Affiliation UNSC Navy Higher Rank Petty Officer First Class Lower Rank Petty Officer Third Class Known Petty Officer Second Classs Numerous SPARTAN-IIs L. P. Graves
	[Source]

Petty Officer Second Class is the fifth enlisted rank (E-5) of the UNSC Navy and is a non-commissioned officer. It is equal in rank 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-IIs upon graduation.^[2] This is most likely due to combat situations in which a Marine NCO has been neutralized, allowing a SPARTAN-II to take command of a squad.

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

Known PersonnelEdit

Shiela Polaski James-005 Li-008 Joshua-029 Vinh-030 Samuel-034 Isaac-039 William-043

Anton-044 Linda-058 Malcolm-059 Cassandra-075 Kelly-087 Grace-093 Nicole-458 Adam-B004

Lucy-B091 Min-B174 Tom-B292 Spartan-Jane Spartan-Robert Spartan-Shane Spartan-Sheila

SourcesEdit

1. ↑ This is the insignia for a US Navy Petty Officer Second Class. However, in Halo 3 the insignia for Master Chief Petty Officer is shown to be similar to that used by the 20th/21st Century US Navy (with the standard Eagle changed for that of the UNSC Phoenix). It is inferred that this applies to all UNSC Navy Enlisted rank insignia.
2. ↑ Halo: The Fall of Reach, page 99

UNSC Defense Force enlisted ranks
	E-1	E-2	E-3	E-4	E-5	E-6	E-7	E-8	E-9	Senior Enlisted Advisor
Air Force:	AB	Amn	A1C	SrA	SSgt	TSgt	MSgt	SMSgt	CMSgt - CCM	CMSAF
Army:	PV1	PV2	PFC	SPC - CPL	SGT	SSG	SFC	MSG - 1SG	SGM - CSM	SMA
Marine Corps:	Pvt	PFC	LCpl	Cpl	Sgt	SSgt	GySgt	MSgt - 1stSgt	MGySgt - SgtMaj	SgtMajMC
Navy:	CR	CA	CN	PO3	PO2	PO1	CPO	SCPO	MCPO - CMDCM - FORCM - FLTCM	MCPON