The Government Communications Security Bureau (GCSB) Tangimoana station, in Manawatū, was opened in 1981. Its presence was revealed to the public in 1984 by peace researcher Owen Wilkes. Wilkes had accidentally discovered the station while holidaying on a friend's farm nearby. The early 1980s was a time of heightened international nuclear tension and a growing campaign for a nuclear-free New Zealand. The Manawatū branch of the International Physicians for the Prevention of Nuclear War brought out this poster to express their concerns over Tangimoana. NSA refers to the US intelligence organisation the National Security Agency.
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