The New York City Police Department, officially the City of New York Police Department, was established in 1845, and is the largest municipal police force in the United States, having 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 United States; tracing its roots back to the first Dutch eight man night watch in 1625, when New York City was New Amsterdam. The NYPD has a broad array of specialized services, including the Emergency Service Unit, canine, 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." In June 2004, there were about 40,000 sworn officers plus several thousand support staff; in June 2005, that number dropped to 35,000.