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UNITED STAI
OMIC ENERGY COMMISSION
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WASHINGTON25, D.C.
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411865
November 23, 1957
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Dear Mr. President:
On August 2, 1957 I wrote you concerning Operation HARDTACK, the
muclear test series planned for the Spring of 1953 at the Eniwetok
Proving Ground. I pointed out that the then estimated number of
nuclear shots for the series was 25, that it was planned to initiate
the series as early as possible and that this date appeared to be
April 1, 1958.
My letter also requested that you note that the
Atomic Energy Commission and Department of Defense were proceeding
with preparations for the series. On August 9 you discussed the
matter of HARDTACK with me and approved starting the series as early
ag possible, directing that the number of nuclear shots be held to
the minimm necessary for attaining the essential defense objectives.
PE CLASSIRICATION CHAMGED Toe
A 3. CONTAINS NO DOE CLASSIRED WAS
Pursuant to your approval we have gone forward with preparations for
the series.
It is apparent now that, if the necessary sclentific
i} objectives are to be realized in the shortest test period and at
34 Least cost, the first shot should be fired on or about April 15.
‘The
remaining shots would follow as quickly thereafter as devices could
be emplaced and desired weather conditions occur.
The Atomic Energy Commission and the Department of Defense have
reviewed individually and collectively our planned firings with the
objective of reducing the number to the minimm consistent with ful-
‘filling essential defense objectives. Approximately 17 laboratory
fe: diagnostic shots will be required to fulfill needed Department of
%°;Defense weapons applications and to examine "clean" designs in a
23 variety of yields.
In addition, the Department of Defense must
conduct five weapons effects tests.
Three of these are intended to
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