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Related to first sergeant: sergeant first class
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.
1. (in the U.S. Army)
a. a noncommissioned officer ranked above a master sergeant.
b. the senior noncommissioned officer of a company, squadron, etc.
2. a noncommissioned officer in the U.S. Marine Corps ranked above gunnery sergeant.
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|Noun||1.||first sergeant - a sergeant in the Army above the rank of staff sergeant and below master sergeant|
orderly sergeant - the first sergeant of a company; duties formerly included the conveyance of orders
sergeant - any of several noncommissioned officer ranks in the Army or Air Force or Marines ranking above a corporal