#patrol.personnel  a group that goes through a region at regular intervals for the purpose of security
  supertype:  personnel__force  group of people willing to obey orders; "a public force is necessary to give security to the rights of citizens"
  member:  patroller
  subtype:  border_patrol  a group of officers who patrol the borders of a country
  subtype:  harbor_patrol  patrol of officers who police a harbor area

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