You can refer to a police force as a constabulary. If your mother and your grandfather were both police officers, you might want to follow the family tradition and join the constabulary as well.

You're most likely to use this word if you live in the United Kingdom, where police officers are known as constables and individual county police forces are often called constabularies. In the U.S., the term is reserved for specially assembled forces, like the ones established in foreign countries following wars — the U.S. constabulary in Germany after World War II is one example.

Definitions of constabulary
  1. noun
    the force of police and officers
    synonyms: law, police, police force
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    European Law Enforcement Organisation, Europol
    police organization for the European Union; aims to improve effectiveness and cooperation among European police forces
    gendarmerie, gendarmery
    French police force; a group of gendarmes or gendarmes collectively
    Mutawa, Mutawa'een
    religious police in Saudi Arabia whose duty is to ensure strict adherence to established codes of conduct; offenders may be detained indefinitely; foreigners are not excluded
    Mounties, RCMP, Royal Canadian Mounted Police
    the federal police force of Canada
    New Scotland Yard, Scotland Yard
    the detective department of the metropolitan police force of London
    secret police
    a police force that operates in secrecy (usually against persons suspected of treason or sedition)
    SS, Schutzstaffel
    special police force in Nazi Germany founded as a personal bodyguard for Adolf Hitler in 1925; the SS administered the concentration camps
    posse, posse comitatus
    a temporary police force
    the secret state police in Nazi Germany; known for its terrorist methods
    type of:
    force, personnel
    group of people willing to obey orders
    law enforcement agency
    an agency responsible for insuring obedience to the laws
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