Department of Defense police for the Department of Defense and its component branches of the US Armed Forces. There is a DoD police agency based at the Pentagon named the United States Pentagon Police, which is part of the Pentagon Force Protection Agency. Formerly the Defense Protective Service (DPS), the Pentagon Police have exclusive jurisdiction within the Pentagon Reservation and have concurrent jurisdiction with other police agencies (state, county, and local) in an area of approximately around the complex. Through a memorandum of understanding (MOU) with Arlington County, U.S. Pentagon Police Officers also possess authority, to enforce laws while on duty in Arlington County,
Streets and highways of Arlington County, Virginia therefore, most roads are unnumbered. This status originated due to the existence of county highway departments in Arlington prior to the creation of the state transportation agency which is now the VDOT in 1927, and the assumption of local roads control by that agency in 1932. The control of the roads system is considered a powerful advantage for community urban planners, who can require developers to contribute to funding needed for road needs serving their projects. Although the streets of Arlington County are not laid out on a grid plan, its local streets follow the Arlington County, Virginia, street-naming system: