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P.O. BOX 1814
WASHINGTON 13,0.C.
dee | 19g
Dear Mr.
Strauss:
22520
R_
he
Your letter of May 28, 1958“Rtated that che Commission has approved
the declassification of the information Listed below concerning shot
PINON of Operation HARDTACK and requested the comments of the Department
of Defense with respect to these declassi fication actions:
The Location and schedule and actual
time of shot.
The device to he tested is contained in a cylindrical
container about 5 feet ih diameter and 12 feet long,
which will weigh abeut 3 tons including the contents.
Also, the center of pravity insofar as it may be revealed
by weighing under each of the four corners of the cradle.
The bomb
fraction
tracer will be
20 tons of uranium
(isotopic composition will remain classified).
The total yield as measured hy fireball photography and
the necessary photography.
(Only the predicted range of
yield will be announced in advance of the test.)
Cloud samples as collected on filter paper and any in-
formation which might he derived From analyzing them
without
the use of any classified information.
a)
Fissiqn yield as determined by radiochemistry at UGBL,
Berkelgy and the analytic procedures used in this determination.
The participants will observe this determination
and way actually assist in carrying out the analyses.
E,CLASBIFIED INFO GRAPRETE
g.
A
Identification of the device being tested as a stockpile
weapon.
The Military Liaison Committee concurs in the declassification of
the information listed in subparagraphs a, c, d, e, and F above.
The
Committee does not concur in the declassification of the weight and
center of gravity information in subparagraph b above nor in the
declassification of the information in subparagraph g above.
The described information is deemed to be classified defense information the
release of which is not essential to the objectives of the operation.
Further, the information contained in subparagraph g is additionally
considered to be not accurate and an entree to undesirable questioning
Dh
MINA
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AY).
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