The United States, Canada, United Kingdom and Australia entered into a weapons effects agreement with the innocuous title of The Technical Co-operation Program (TTCP). The first HE event conducted under this program was a 5-Ton shot in Canada in 1959. Canada was chosen because large tracts of land were available and anti-nuclear sentiment was relatively low. This event was followed by more and larger events until in 1964 a 500-Ton shot nicknamed Operation SNOWBALL was conducted, also in Canada.
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