Answer: serg

AnswerCrossword Clue
SERGThree-striper: Abbr.
SERGWearer of three chevrons: Abbr.
SERGNoncom.
SERGNCO.
SERGPolice officer below a lieutenant: Abbr.
SERGPolice officer: Abbr.
SERGArmy man: Abbr.
SERGAfter corp.
SERGN.C.O.
SERGAn NCO
SERGAn N.C.O.
SERGErstwhile corp.