Fort Bliss, Texas, houses the United States Army Air Defense Artillery Center and School. Troops train there to operate antiaircraft artillery and guided missiles. The post's firing ranges cover about 1,100,000 acres (445,000 hectares) in Texas and New Mexico. The base was established in 1848 as an infantry post. In 1854, it was named Fort Bliss for Lieutenant Colonel William W. S. Bliss, an aide to the future U.S. President Zachary Taylor during the Mexican War (1846-1848).