, wt TOP-SECRET— “ENCLOSURE "B" UNIVERSITY OF CALIFORNIA Los Alamos Seflentific Laboratory P,O, Box 1663 Los Alamos, New Mezico ee September 1953 Brig. General KE. Fields Director of Military Applieation Ueio Atomie Energy Commission Washington 25, D.C Dear General Fields: As you are aware, extended discussions regarding the CASTILE operation took place at the Los Alamos Scientific Laboratory cn iv and 18 September between representatives of Holmes and Narver, ue Eniwetok Field Office. the Santa Fe Operations Office, the San Francisco Operations Office, the Radiation Laboratory (Livermore), the Oak Ridge Operations Office, Carbide and Carbon Chemi- cals Company (ADP Plant), Joint Task Fore? 7, the Los Alamos Setentific Laboratory, and your office, As the result of these discussions, comclusions were reached regarding the proposed content and schedule of ee CASTLE perorram which it is the purpose or this letter to report. The LASL vronoses to test at CASTLE four thermonuclear syatems of which cextain details are given in Appendix I. systems are as follows: aw - 10 - TO WC iR Ain as ‘These Enclosure "B” fey ier

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