Five Eyes
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The Five Eyes (FVEY) is an Anglosphere intelligence alliance comprising Australia, Canada, New Zealand, the United Kingdom, and the United States. These countries are parties to the multilateral UK-USA Agreement, a treaty for joint cooperation in signals intelligence. Informally, Five Eyes can refer to the group of intelligence agencies of these countries.
NSA Headquarters, Fort Meade, Maryland, United States
ASIO central office, Canberra, Australia
GCHQ, Cheltenham, Gloucestershire, United Kingdom
CSE Headquarters, Ottawa, Ontario, Canada
UKUSA Agreement
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The United Kingdom – United States of America Agreement is a multilateral agreement for cooperation in signals intelligence between Australia, Canada, New Zealand, the United Kingdom, and the United States. The alliance of intelligence operations is also known as the Five Eyes. In classification markings this is abbreviated as FVEY, with the individual countries being abbreviated as AUS, CAN, NZL, GBR, and USA, respectively.
The Waihopai Valley Facility – base of the New Zealand branch of the ECHELON Program
This diagram depicts the relationship between the US National Security Agency (NSA) and the so-called "second parties", which comprises the UKUSA community, and the "third parties" made up of members of the North Atlantic Treaty Organization (NATO) and other Western allies: NSA and second parties—Extensive mutual sharing of signals intelligence NSA and third parties—Signals intelligence is funnelled to the NSA in exchange for surveillance technology and monetary compensation.
Cover page of the 1946 UKUSA Agreement
Signatures of the Chiefs of staff of Britain and America (March 1946)