The Patrol Services Bureau is one of the most visible units of the NYPD. The bureau plans, directs, and coordinates the department's uniformed officers in law enforcement patrol operations. Under the Chief of Patrol, there are eight borough commands, each headed by an assistant chief. While each of the boroughs has at least one patrol borough command, the boroughs of Manhattan, Queens and Brooklyn have two commands due to their sizes. The borough commands exercise authority over the various seventy-seven police precincts.