The Indian Health Service, as part of the Public Health Service, provides a comprehensive health services delivery system for American Indians and Alaska Natives. It assists Native American tribes in developing their health programs; facilitates and assists tribes in coordinating health planning, obtaining and utilizing health resources available through Federal, State, and local programs, operating comprehensive health programs, and evaluating health programs; and provides comprehensive health care services including hospital and ambulatory medical care, preventive and rehabilitative services, and development of community sanitation facilities.