In the Air Force, a combination of land and facilities comprised of a main installation and its noncontiguous properties (auxiliary air fields, annexes, and missile fields) that provide direct support to or are supported by that installation. Installation complexes may comprise two or more properties, e.g., a major installation, a minor installation, or a support site, each with its associated annex(es) or support property(ies). See also minor installation.
Dictionary of Military and Associated Terms. US Department of Defense 2005.