Anglosphere refers to a set of English-speaking nations with a similar cultural heritage, based upon populations originating from the nations of the British Isles (England, Wales, Scotland and Ireland), and which today maintain close political and military cooperation. While the nations included in different sources vary, the term anglosphere usually does not include all countries where English is an official language, although the nations that are commonly included were all once part of the British Empire. In its most restricted sense, the term covers the United Kingdom, Ireland, the United States, Canada, Australia and New Zealand, which post-British Empire maintain a close affinity of cultural, familial and political links with one another. Additionally, all these countries (except Ireland) are militarily aligned under the following programs: UKUSA Agreement (signals intelligence), Five Eyes (intelligence), Combined Communications Electronics Board (communications electronics), The Technical Cooperation Program (technology and science), Air and Space Interoperability Council (air forces), AUSCANNZUKUS (navies), and ABCA Armies.