Walter Reed Army Medical Center  The Walter Reed Army Medical Center (WRAMC)—known as Walter Reed General Hospital (WRGH) until 1951—was the U.S. Army's flagship medical center from 1909 to 2011. Located on in the District of Columbia, it served more than 150,000 active and retired personnel from all branches of the military. The center was named after Major Walter Reed (1851–1902), an Army physician who led the team that confirmed that yellow fever is transmitted by mosquitoes rather than direct contact. Since its origins, the WRAMC medical care facility grew from a bed capacity of 80 patients to approximately 5,500 rooms covering more than of floor space. WRAMC combined with the National Naval Medical Center at Bethesda, Maryland in 2011 to form the tri-service Walter Reed National Military Medical Center (WRNMMC). The grounds and historic buildings of the old campus are being redeveloped as the Parks at Walter Reed. Fort Lesley J. McNair, located in the southwest of the District of Columbia on land set aside by George Washington as a military reservation, is the third oldest U.S. Army installation in continuous use in the United States after West Point and Carlisle Barracks. Its position at the confluence of the Anacostia River and the Potomac River made it an excellent site for the defense of the nation's capital. Dating back to 1791, the post served as an arsenal, played an important role in the nation's defense, and housed the first U.S. Federal Penitentiary from 1839 to 1862. Today, Fort McNair enjoys a strong tradition as the intellectual headquarters for defense. Furthermore, with unparalleled vistas of the picturesque waterfront and the opposing Virginia shoreline, the historic health clinic at Fort McNair, the precursor of today's Walter Reed Army Medical Center (WRAMC), overlooks the residences of top officials who choose the famed facility for the delivery of their health care needs. "Walter Reed's Clinic," the location of the present day health clinic at Washington, D.C., occupies what was from 1898 until 1909 the General Hospital at what was then Washington Barracks, long before the post was renamed in honor of Lt. Gen. McNair who was killed in 1944. The hospital served as the forerunner of Walter Reed General Hospital; however, the Victorian era waterfront dispensary remains and is perhaps one of America's most historically significant military medical treatment facilities. It is reported that Walter Reed lived and worked in the facility when he was assigned as Camp Surgeon from 1881 to 1882.