Private First Class

From Halopedia, the Halo wiki

Private First Class
Marine Corps Army
Affiliation	UNSC Marine Corps and UNSC Army
Higher Rank	Lance Corporal (Marines) Specialist (Army)
Lower Rank	Private (Marine Corps) Private (E-2) (Army)
Known Private First Classs	Chips Dubbo M. Fitzgerald Hosky Wallace A. Jenkins Suzuki Michael Crespo Dimitrov^[1]

[Source]

Private First Class, or PFC, is the second enlisted rank in the UNSC Marine Corps and third in the UNSC Army. A Marine PFC is equal in rank to Crewman Apprentice in the UNSC Navy and an Airman in the Air Force. An Army PFC is equal to Crewman in the Navy and Airman First Class in the Air Force. In the Marine Corps, it is one rank above Private, and one rank under Lance Corporal. In the Army, it is one rank above Private (E-2) and one rank below Specialist.

[edit] Sources

^ Halo: Combat Evolved Anniversary Bulletin Board

UNSC Defense Force enlisted ranks
Pay Grade → Branch of Service ↓	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