<P> The New York City Police Department (NYPD), officially the City of New York Police Department, is the largest municipal police force in the United States . Established in 1845, the agency has primary responsibilities in law enforcement and investigation within the five boroughs of New York City . The NYPD is one of the oldest police departments established in the U.S., tracing its roots back to the nineteenth century . </P> <P> The NYPD has a broad array of specialized services, including the Emergency Service Unit, K9, harbor patrol, air support, bomb disposal, counter-terrorism, criminal intelligence, anti-gang, anti-organized crime, narcotics, public transportation, and public housing; the New York City Transit Police and New York City Housing Authority Police Department were fully integrated into the NYPD in 1995 . According to the department, its mission is to "enforce the laws, preserve the peace, reduce fear, and provide for a safe environment ." The department's regulations are compiled in title 38 of the New York City Rules . </P> <P> In June 2004, there were about 40,000 sworn officers plus several thousand civilian employees; in June 2005, the number of officers dropped to 35,000 . As of December 2011, that figure increased slightly to over 36,600, helped by the graduation of a class of 1,500 from the New York City Police Academy . The NYPD's current authorized uniformed strength is 34,450 . There are also approximately 4,500 Auxiliary Police Officers, 5,000 School Safety Agents, 2,300 Traffic Enforcement Agents, and 370 Traffic Enforcement Supervisors currently employed by the department . The Patrolmen's Benevolent Association of the City of New York (NYC PBA), the largest municipal police union in the United States, represents over 50,000 active and retired NYC police officers . </P> <P> The NYPD Intelligence Division & Counter-Terrorism Bureau has officers stationed in 11 cities internationally . In the 1990s the department developed a CompStat system of management which has also since been established in other cities . </P>

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