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.