The characterization of health support for the distribution of medical resources and capabilities. a. Role 1. Provides medical treatment, initial trauma care, and forward resuscitation, not including surgical care. Also known as unit-level medical care. b. Role 2. Provides medical treatment, advanced trauma management, emergency surgery, and resuscitative care. c. Role 3. Provides emergency and specialty surgery, intensive care, medical specialty care, and extended holding capacity and capability augmented by robust ancillary support. d. Role 4. Provides the full range of preventive, acute, restorative, curative, rehabilitative, and convalescent care found in United States base hospitals and robust overseas facilities.