Master Chief Petty Officer is an E-9 rank of the UNSC Navy, and is a non-commissioned officer. It is equal in rank to Master Gunnery Sergeant in the UNSC Marine Corps, Sergeant Major in the UNSC Army, and Chief Master Sergeant in the UNSC Air Force. Master Chief Petty Officer ranks just above Senior Chief Petty Officer.
- ↑ This is the insignia for a UNSC Master Chief Petty Officer. However, in Halo 3, the insignia for Master Chief Petty Officer of the Navy is shown to be the same as the insignia from the US (with the standard "crow" changed for that of the UNSC "crow"). It is inferred that this applies to all UNSC Navy enlisted rank insignias.