APPENDIX "B"™ DRAFT LETTER FROM THE CHAIRMAN TO THE DIRECTOR OFFICE OF DEFENSE MOBILIZATION 1, The Atomic Energy Commission has approved declassification of the weapons effects information covered in your letter of April 15, 1955. 2, The Armed Forces Special Weapons Project has been re- quested to furnish to the Atomic Energy Commission the informetion relative to the items listed in paragraph B of the above reference for a range of yields up to and including 100 megatons, This information will be forwarded to you by the AEC as soon as practicable, and should prove adequate for your staff to prepare a brief handbook for public guidance in dispersion planning. 3. Concerring the matter of fixing the optimum weapon yield as a basis for planning, we believe that this 1s a question in which the AEC has an interest but is not competent to unilaterally determine, We believe, however, that an inter- departmental group somewhat as you recommended could serve the very useful purpose of examining this question in detail, For membership on such a technical group we would recommend representatives from the Office of Defense Mobilization, Department of Defense, Central Intelligence Agency, and the Atomic Energy Commission, 4, The Commission would appreciate an opportunity to review prior to release,any information prepared for public guidance based on such information as is furnished in fulfilling your request, -3- Appendix "B"