Arlington County Police Department Police arrested people for violating Virginia's segregation laws. In 1963, the agency assumed its present name. In September 2001, the Arlington County P.D. responded to the Pentagon after terrorists attacked it during the September 11 attacks, as the building is located in the county. Since the establishment of the Arlington County Police Department, 7 officers have died in the line of duty, the most recent in 2016 as a result of an illness caused by the September 11 attacks of 2001. The Chief of Police as of August 2017 is M. Jay Farr. He was appointed by the County Manager
Construction of the Virginia approaches to Arlington Memorial Bridge begin construction, but it ended after the county election in November 1931 left supervisors safe in office for another two years. Arlington County engineers quickly called the Washington Boulevard route south of the cemetery inappropriate. The Washington Boulevard route received a significant boost when, on January 27, 1933, Arlington County, the NCPC, and the United States Department of War reached an agreement on rights-of-way along the route. The agreement gave the county a right-of-way across Fort Meyer and the southwestern tip of Arlington National Cemetery and another right-of-way from the cemetery to Mount Vernon Memorial Parkway across War Department land.