The term used by the American Hospital Association (AHA) in its listing of hospitals in the AHA Guide to the Health Care Field to indicate the kind of organization or institution responsible for operating the hospital. Some 24 categories are used. In the non-federal sector, the grouping is quite general, such as “church-operated” and “investor-owned (for- profit), partnership.” In the federal sector, however, classification is much more specific; for example “Army” hospitals are separated from Navy hospitals.