UNITED STATES
im ROPLY REFER TO.
ATOMIC ENERGY COMMISSION
WASHINGTON 25, D.C.
MAT: NDG
JAN2 i 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 appreval has been received for executing CASTLE
with March 1, 195) as the starting date. Permission has also
been eranted to detonate seven shots and to e.pend tissionable
and fusionable materials in the amounts inaicated Ltelow.
This letter should be construed as your authority to execute
CASTLE as planned.
Sincerely yours,
K. D. Nichols
General Manager
Enclosure:
Cys 1A & 24 Fissionable and Fusionable
Haterial For CASTLE Devices
433
Lid