Walter Reed Army Medical Center, in Washington, D.C., provides care for active-duty and retired military personnel and their families. It also conducts scientific research and trains doctors in advanced methods. Its main campus covers 113 acres (46 hectares) in Washington. The center's Forest Glen annex in Silver Spring, Maryland, covers 164 acres (66 hectares). Major activities on the Walter Reed grounds include the treatment facility, the Walter Reed Army Institute of Research, and the Armed Forces Institute of Pathology. The center was named for Major Walter Reed, an Army surgeon who helped conquer typhoid fever and yellow fever (see Reed, Walter). In 2005, federal officials approved a plan to close the center. Most of its services will move to the National Naval Medical Center in Bethesda, Maryland, which will be renamed the Walter Reed National Military Medical Center.