UNITED STATES
ATOMIC ENERGY COMMISSION
IN ROPLY REFER TO:
MAT: NDG
WASHINGTON 25, D.c.
JAN2 3 1954
Major General P. W. Clarkson, USA
Commander, Joint Task Force SEVEN
Temporary "U" Euilding, Room 2005
12th and Constitution Avenue, N. W.
Washington 25, D. C.
Dear General Clarkson:
Presidential approval has been received for executing CASTLE
with March 1, 195 as the starting date.
Permission
as also
sionable
and fusionable materials in the amounts inaicated Lelbw.
been eranted to detonate seven shots and to expend fi
This letter should be construed as your authority to Pxecute
CASTLE as planned.
Sincerely yours,
K. D. Nichols
General Manager
Enclosure:
Cys 1A & 2A Fissionable and Fusionable
Haterial For CASTLE Devices
433
j
tS