The Carl R. Darnall Army Medical Center is a United States Department of Defense medical facility at Fort Hood, Texas. It provides medical care to servicemembers and their families, along with veterans and their dependents, in and around the largest U.S. military installation in the world. Named after inventor of water chlorination Brigadier General Carl Rogers Darnall, MD., the core of the medical center is a state of the art 947,000-square-foot hospital. The facility opened in 2016, and includes a full primary care and emergency medical facility, including a level III trauma center, and specialized care in obstetrics and gynaecology, orthopedics, and behavioral health. The hospital provides treatment to nearly 3,000 patients daily. The medical center is one of the largest in the Military Health System, comprising more than 105 buildings in addition to the main facility, spread over Fort Hood, three local communities, and a clinic at the Red River Army Depot in Bowie County, Texas, outside of Texarkana. The medical center and its outlying facilities are staffed nearly entirely by uniformed servicemembers of the U.S. Army, however in 2019, the administrative control of the facility was shifted from United States Army Medical Command to the Defense Health Agency, an integrated joint Department of Defense combat support agency. All patients of the facility are insured and billed through Tricare, the health insurance system of the DoD. The medical center is led by Colonel Richard G. Malish. History 1965: Darnall Army Community Hospital On 5 April 1963, the Army broke ground at Fort Hood for the new Darnall Army Community Hospital, meant to replace a World War II era hospital. Constructed in the latest military design, the original building cost $6 million and was furnished with an additional $6 million of equipment. Darnall was dedicated on April 16, 1965. At the time, Darnall was the first of three permanent Army hospitals of the 200 to 300 bed size to open in the U.S. Built to support a one-division installation of 17,000 troops, the original structure was soon outgrown as Fort Hood expanded to a full-fledged corps size installation. 1984: expansion To meet the growing medical needs, the Army began a $49.7 million addition and reconstruction project in 1979 that was completed on December 13, 1984. By the completion of the 1984 project, Darnall had doubled in size. Outpatient clinic space tripled, the number of operating rooms increased from five to