The Police Museum gives visitors an insider's look at the history and traditions of the largest police force in the country and its role in the history of New York City. With artifacts that date all the way back to the Dutch settlers, visitors can discover the impact of the NYPD over the last three centuries. They will find out the reason police precincts around the nation are marked with green lights outside their doors, why officers are called cops, why their bosses are called brass and which came first, the Model T or the Highway Unit? Visitors will hear the moving stories of officers responding to the tragic attacks of September 11, 2001 and learn how the NYPD now works beyond the borders of New York City to ensure the safety of every citizen. They will also view the shields of every officer killed in the line of duty since 1845, and can contemplate the bravery and dedication it takes to be one of New York's Finest.