Tricare (styled TRICARE), formerly known as the Civilian Health and Medical Program of the Uniformed Services (CHAMPUS), 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. The Tricare program was managed by Tricare Management Activity (TMA) under the authority of the Assistant Secretary of Defense (Health Affairs). Tricare is the civilian care component of the Military Health System, although historically it also included health care delivered in the military medical treatment facilities.
On 1 October 2013 TMA disestablished and Tricare responsibility was transferred to the Defense Health Agency (DHA) which was established on the same day.
Historically, health care for military personnel and their dependents was provided in military medical facilities as promised by the military, and through a referral system, by civilian medical personnel where military physicians were not available in a certain specialty, or when and where overcrowding of a military medical facility occurred.
Active duty military personnel always have priority for care in military medical facilities. After World War II and the Korean War, especially with the growth in the standing forces of the U.S. military due to the Cold War, access to care in military facilities became increasingly unavailable for military retirees and the dependents of both active duty and retired military personnel due to resource constraints and growing demands on the system. It was at this time that the concept of "space-available basis" for military retirees and military dependents was first noted. To address this problem, Congress passed the Dependents Medical Care Act of 1956 and the Military Medical Benefits Amendments of 1966. These acts allowed the Secretary of Defense to contract with civilian health care providers. This civilian health care program became known as the Civilian Health and Medical Program of the Uniformed Services (CHAMPUS) in 1966.