Tricare (styled TRICARE) is a health care program of the United States Department of Defense Military Health System. Tricare provides civilian health benefits for U.S Armed Forces military personnel, military retirees, and their dependents, including some members of the Reserve Component. Tricare is the civilian care component of the Military Health System, although historically it also included health care delivered in military medical treatment facilities. Tricare functions similar to a single-payer healthcare system.