UNSC rank structure/NAVCOM
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Enlisted ranks
| Rank[navcomnote 1] | Crewman Recruit (CR) | Crewman Apprentice (CA) | Crewman (CR) | 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 2] (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 |
Officer ranks
| 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[note 1] | Captain of line warship or installation[note 2] | Battle group commander[note 1][note 2] | Command of Sector fleet or academy | HIGHCOM staff | Fleet commander |
Notes
- ^ 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.
- ^ 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".
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