 The system's critical care services are accessible to patients within a radius through five LIFE FORCE air ambulance helicopters, each equipped to perform in-flight surgical procedures and transfusions.Founded in 1889, Erlanger is a large public healthcare system with more than half a million patient visits a year.As the primary teaching hospital for the University of Tennessee College of Medicine's Chattanooga campus, Erlanger trains physicians enrolled annually in the medical college's residency and fellowship programs.