The U.S. Army Corps of Engineers offers a range of design, engineering, construction, environmental and real estate development services. It serves residents in Maryland, Virginia, Pennsylvania, Delaware, New York and Washington, D.C. The organization supports the construction of defense medical and technological research facilities. The U.S. Army Corps additionally designs and cleans up formerly used defense and civilian sites. It provides cultural resource management, historical preservation, and rehabilitation and military installation support services. The organization is also one of the largest water resource development agencies in the United States and offers flood damage reduction, water supply, and shore, wetland and hurricane protection services.