First-sergeant meaning

The senior noncommissioned officer of a US Army or Marine Corps unit, who is equivalent in rank to a master sergeant and performs administrative duties.
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(u.s. army, u.s. marine corps) The noncommissioned officer, usually a master sergeant, serving as chief administrative assistant to the commander of a company, battery, etc.
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(US) In the United States Army, a non-commissioned officer ranking above sergeant first class and below sergeant major; equal in rank to a master sergeant but with greater command authority.
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(US) In the United States Marine Corps, a non-commissioned officer ranking above gunnery sergeant and below sergeant major or master gunnery sergeant; equal in rank to a master sergeant, but with command rather than technical responsibilities.
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(US) In the United States Air Force, an appointment (not a rank) for the senior member of enlisted personnel in a squadron or other unit. The appointment is usually held by a master sergeant.
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