for the US State–Army–Navy Communication Intelligence Board. Although the original agreement states that the exchange would not be "prejudicial to national interests", the United States often blocked information sharing from Commonwealth countries. The full text of the agreement was released to the public on 25 June 2010. The "Five Eyes" term has its origins as a shorthand for a "AUS/CAN/NZ/UK/US EYES ONLY" classification level. Onset of the Cold War (1950s–1960s) Under the agreement, the GCHQ and the NSA shared intelligence on the Soviet Union, the People's Republic of China, and several Eastern Bloc countries (known as Exotics). The network was expanded in the 1960s into the Echelon collection and analysis network. The treaty was extended to include Canada (1948), Australia (1956) and New Zealand (1956). In 1955, the agreement was updated to designate Canada, Australia and New Zealand as "UKUSA-collaborating Commonwealth countries". Other countries that joined as "third parties" were Norway (1952), Denmark (1954) and West Germany (1955). Investigations (1970–90s) In the aftermath of the 1973 Murphy raids on the headquarters of the Australian Security Intelligence Organisation (ASIO), the existence of the UKUSA Agreement was revealed to Australia's Prime Minister Gough Whitlam. After learning about the agreement, Whitlam discovered that Pine Gap, a secret surveillance station close to Alice Springs, Northern Territory, had been operated by the US Central Intelligence Agency (CIA). At the height of the 1975 Australian constitutional crisis, the use and control of Pine Gap by the CIA was strongly opposed by Whitlam, who fired the chief of the ASIO before being dismissed as prime minister. The existence of several intelligence agencies of the Five Eyes was not revealed until the following years: 1974 In Canada, an investigative television report on CBC News's newsmagazine program The Fifth Estate revealed the existence of the Communications Security Establishment Canada (CSEC). 1975 In the United States, the Church Committee of the Senate revealed the existence of the National Security Agency (NSA). 1976 In Britain, an investigative article in Time Out magazine revealed the existence of the Government Communications Headquarters (GCHQ). 1977 In Australia, the Hope Commission revealed the existence of Australian Secret Intelligence Service (ASIS) and the Defence Signals Directorate (DSD). 1980 In New Zealand, the existence of the Government Communications Security Bureau (GCSB) was officially disclosed on a "limited basis". In 1999, the Australian government acknowledged that it "does co-operate with counterpart signals intelligence organisations overseas under the UKUSA