The David Grant USAF Medical Center (DGMC) at Travis Air Force Base in Fairfield, California, is the United States Air Force's largest medical center in the continental United States and serves military beneficiaries throughout eight western states. It is a fully accredited hospital with a National Quality Approval gold seal by the Joint Commission, and serves more than 500,000 Department of Defense and Department of Veterans Affairs Northern California Health Care System eligible beneficiaries in the immediate San Francisco–Sacramento vicinity from 17 counties covering 40,000 square miles. Originally known as Travis Air Force Base Hospital, DGMC was renamed in 1966 in honor of David Norvell Walker Grant, the first Surgeon General of the United States Army Air Corps and United States Army