Definition of platoon sergeant
: a noncommissioned officer normally with the rank of sergeant first class in the U.S. Army and with the rank of staff sergeant in the U.S. Marine Corps
Note: Platoon sergeant was formally its own rank in both the U.S. Army and U.S. Marines.
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Merriam-Webster unabridged
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Time Traveler for platoon sergeant
The first known use of platoon sergeant was in 1890
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