Organizational structure of the United States Department of Defense of the Treasury. According to the U.S. Code, the Coast Guard is at all times considered one of the five armed services of the United States. During times of declared war (or by Congressional direction), the Coast Guard operates as a part of the Navy; this has not happened since World War II, but members have served in undeclared wars and conflicts since then while the service remained in its peacetime department. The Pentagon, in Arlington County, Virginia, across the Potomac River from Washington, D.C., is the Department's headquarters. The Department is protected by the Pentagon Force Protection Agency, which
Lyon Village, Arlington, Virginia Lyon Village, Arlington, Virginia Lyon Village is a neighborhood, or "urban village" located in Arlington County, Virginia, along Lee Highway (U.S. Route 29). It adjoins Arlington County's government center (including the courthouse and police/jail complex), and is approximately one mile west of Rosslyn and less than a mile north of Clarendon, of which it is sometimes considered a sub-neighborhood, as is Cherrydale, the mostly residential district immediately west of Lyon Village. The Lyon Village Historic District encompasses 1,073 contributing buildings and 1 contributing structure. The District as a "cohesive residential neighborhood in northern Arlington County, Virginia, located immediately north of