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Senior Chief Petty Officer

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Senior Chief Petty Officer is the eighth enlisted rank of the UNSC Navy and is a non-commissioned officer. It is equal in rank to Master Sergeant and First Sergeant in the UNSC Marine Corps and UNSC Army respectively, and Senior Master Sergeant in the UNSC Air Force. It is directly above Chief Petty Officer and directly below Master Chief Petty Officer.

In informal settings, Senior Chief Petty Officers are typically called "Senior."


  1. This is the insignia for a US Navy Senior Chief Petty Officer. However, in Halo 3 the insignia for Master Chief Petty Officer is shown to be the same as for 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 insignes.
  2. Halo: The Fall of Reach - page 35

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