UNSC rank structure/NAVCOM

Rank^{[navcomnote 2]}	Crewman Recruit (CR)	Crewman Apprentice (CA)	Crewman (CR)^{[navcomnote 3]}	Petty Officer Third Class (PO3)	Petty Officer Second Class (PO2)	Petty Officer First Class (PO1)	Chief Petty Officer (CPO)	Senior Chief Petty Officer (SCPO)	Master Chief Petty Officer^{[navcomnote 4]} (MCPO)
Typical responsibilities	Boot camp and training school	Initial fleet assignment	Work crew	Work party lead	Compartment supervisor	Work division supervisor	Deck supervisor	Oversight of ship enlisted personnel	Fleet administration or HIGHCOM staff

Rank code	OT	WO-1	WO-2	O-1	O-2	O-3	O-4	O-5	O-6	O-7	O-8	O-9	O-10
Rank	Cadet (CDT)	Warrant Officer (WO)	Chief Warrant Officer (WO-2)	Ensign (ENS)	Lieutenant Junior Grade (LTJG)	Lieutenant (LT)	Lieutenant Commander (LCDR)	Commander (CDR)	Captain (CAPT)	Rear Admiral (RADM)	Vice Admiral (VADM)	Admiral (ADM)	Fleet Admiral (FADM)
Typical responsibilities	No command authority	Resident technical expert	Command advisor or captain of utility ship	Initial officer posting	Command of staff section	Command of work division or Captain of support ship	First officer on small warship or command of ship department	HIGHCOM staff or captain of small warship^{[navcomnote 5]}	Captain of line warship or installation^{[navcomnote 6]}	Battle group commander	Command of Sector fleet or academy	HIGHCOM staff	Fleet commander

^ ^a ^b All table information sourced from Halo: Official Spartan Field Manual pages 140-141, except where otherwise noted.
^ Rank codes are not provided for enlisted Naval personnel in Halo: Official Spartan Field Manual. While it is likely they use the same "E-1, E-2" etc. system as other rank codes, they are omitted from this table as to only display confirmed information.
^ The "CR" abbreviation is also used for Crewman Recruit in the Halo: Official Spartan Field Manual. In real life Crewman uses the abbreviation "CN", leading to it likely a typo for Crewman to use this. CR is however used here due to it appearing in one source.
^ Although Master Chief Petty Officer is the official rank held by many naval servicemen, they are typically referred to as "Top Chief" by crew out of respect for John-117, more commonly known as "The Master Chief".
^ Commanders have also been shown to command small fleets and battle groups, an example being Commander Miranda Keyes commanding Seventh Fleet and Commander Lasky commanding Battle Group Dakota.
^ Captains have also been shown to command entire fleets and battle groups, an example being Captains Del Rio and Lasky commanding Expeditionary Strike Group 1 Fleet and Captain Veredi commanding Battle Group 4.

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