I don't believe so. The full E-9 "title" in the US Navy is Matter Chief Petty Of... | Hacker News

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seizethegdgap on April 26, 2022 | parent | context | favorite | on: MCC (Master Chief Collection) Server Incident Summ...

I don't believe so. The full E-9 "title" in the US Navy is Matter Chief Petty Officer, so plural would be Master Chief Petty Officers

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