The Military Police of Rio de Janeiro State (Portuguese: Polícia Militar do Estado do Rio de Janeiro) (PMERJ) like other military polices in Brazil is a reserve and ancillary force of the Brazilian Army, and part of the System of Public Security and Brazilian Social Protection. Its members are called "state military" personnel. The primary mission of PMERJ is ostensively preventive policing for the maintenance of public order in the State of Rio de Janeiro.