<Li> Sergeant: Three chevrons, a police officer who supervises an entire watch shift in smaller departments and areas of a precinct and individual detective squads in larger departments . Some agencies, such as the New Jersey State Police, use a para-militaristic range of sergeant ranks, such as Staff Sergeant and Sergeant First Class, in addition to the basic Sergeant rank . </Li> <Li> Detective / Inspector / Investigator: An investigatory specialist, usually working in plain clothes . This may be in several classes that correspond to higher supervisory and pay grades . In the NYPD, the detective rank is technically a designation: detectives do not actually outrank police officers although they are in charge of cases and are often senior in years of service, and so have a certain degree of authority beyond police officers in specific situations . </Li> <Li> Officer / Deputy / Trooper / Corporal: A regular officer / deputy wears no rank insignia, and there may be several pay grades . Corporals, who may be senior officers or acting watch commanders, wear two chevrons . </Li> <P> In a few departments, such as New York City and Philadelphia, officers from the rank of Lieutenant and up wear a white shirt instead of the dark blue or black uniform shirt common to lower - ranked police officers . Senior police officers may wear fretting ("scrambled eggs") on their hat visors . </P>

What does 2 stripes on a cop mean
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