by Theodore Caplow, Middletown Families (1982) and All Faithful People (1983). Caplow returned to Muncie in 1998 to begin another study, Middletown IV, which became part of a Public Broadcasting Service documentary titled "The First Measured Century", released in December 2000. The Ball State Center for Middletown Studies continues to survey and analyze social change in Muncie. A database of Middletown surveys conducted between 1978 and 1997 is available online from the Association of Religion Data Archives (ARDA). Due to the extensive information collected from the Middletown studies during the twentieth century, Muncie is said to be one of the most studied cities of its size in the United States. In addition to being called a "typical American city", as the result of the Middletown studies, Muncie is known as Magic City or Magic Muncie, as well as the Friendly City. World War II to the present During World War II the city's manufacturers once again turned their efforts to wartime production. Ball State and Muncie's airport also trained pilots for the U.S. Navy. The postwar era was another period of expansion for Muncie, with continued growth and development of industries, construction of new homes, schools, and businesses. A population boom brought further development, especially from 1946 to 1965. Since the 1950s and 1960s Muncie has continued as an education center in the state and emerged as a regional health center. As enrollment at Ball State increased, new buildings were erected on the college's campus. Ball Memorial Hospital also expanded its facilities. However, by the 1960s, industrial trends had shifted. Beginning in the 1970s several manufacturing plants closed or moved elsewhere, while others adapted to industrial changes and remained in Muncie. Ball Corporation, for example, closed its Muncie glass manufacturing facilities in 1962 and its corporate headquarters relocated to Broomfield, Colorado in 1998. Muncie was also home to other manufacturing operations, including Warner Gear (a division of BorgWarner), Delco Remy, General Motors, Ontario Corporation, A. E. Boyce Company, and Westinghouse Electric, among others. In 2017, the Muncie Community Schools system was declared a "distressed political subdivision", and put in direct control of the state government. In 2018, the school district was reformed and a new board was appointed by Ball State's Board of Trustees. In 2021, following the Fall of Kabul and the U.S. withdrawal from the War in Afghanistan, several Afghan refugees arrived in Camp Atterbury, near Edinburgh, Indiana.