From Halopedia, the Halo wiki
Commander, abbreviated to CDR, is a commissioned officer rank of O-5 in the United Nations Space Command Naval Command (NAVCOM) rank structure; including the UNSC Navy and Office of Naval Intelligence. It is preceded by Lieutenant Commander, and subordinate to a Captain.[1]
HIGHCOM staff or captain of small warship.[1] Commanders have also been shown to command small fleets and battle groups, an example being Commander Miranda Keyes commanding Seventh Fleet and Commander Thomas Lasky commanding Battle Group Dakota.
Commander - Halo 2: Anniversary (Angle 1)
Commander - Halo 2: Anniversary (Angle 2)
Commander - Halo 2: Anniversary (Dress Uniform)
Commander - Halo 2: Anniversary (Screen)
Commander - Halo 3 (Angle 1)
Commander - Halo 3 (Angle 2)
Commander - Halo 4 (Angle 1)
Commander - Halo 4 (Angle 2)
Commander - Halo 2 (Miranda)
Commander - Halo 2: Anniversary (Miranda)
Commander - Halo 2: Anniversary (Miranda - Dress Uniform)
Commander - Halo 3 (Miranda)
Commander - Halo 4 (Lasky)
Commander - Halo: Escalation (Bradley)
Commander - Halo: Collateral Damage (Yao)
Enlisted: 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
Enlisted: Private • Private, First Class • Lance Corporal • Corporal • Sergeant • Staff Sergeant • Gunnery Sergeant • Master Sergeant • First Sergeant • Master Gunnery Sergeant • Sergeant Major