buck sergeant

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Noun1.buck sergeant - a sergeant of the lowest rank in the military
police sergeant, sergeant - a lawman with the rank of sergeant
References in periodicals archive ?
Marine Corps and served during Vietnam; Jack Spangler of Goodlettsville who served as a Buck Sergeant in the U.
He was demobbed two days later, ranked a buck sergeant.
Turner served seven years in the enlisted corps, eventually earning the rank of buck sergeant (E-5).