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 ?
He was demobbed two days later, ranked a buck sergeant.
S Women's Army Air Corps attaining the rank of Buck Sergeant and was stationed in Washington, DC.
Turner served seven years in the enlisted corps, eventually earning the rank of buck sergeant (E-5).