4, The ODM was advised by letter dated September 24, 1954, (AEC 540/22) that the DOD was considering for planning purposes, the effects of a 60 MT weapon, By letter dated April 15, 1955, (AEC 540/39) ODM requested that consideration be given to the release of the 60-megaton yield as the basis for vulnerability planning, or, alternatively, such other yield as the Commission may indicate, The ODM desires such information for planning adispersicn of industry, Since there is a considerable lack of specific information as to the maximum weapon yield which is vrithin the capabilities of the USSR to deliver, it appears appropriate for the Government agencies concerned with this matter to fori an interdepartmental committee which can determine a reasonable yield which will be used for dispersal planning. 5. Ina letter to the Commission dated February 10, 1955, (AEC 540/37), FCDA set forth a requirement to furnish to State anc local civil defense planners official data which would at least give the order of magnitude of the fallout effect of large-yleld weapons. A public release covering this subject was made February 15, 1955, In addition the following statement which is indicative of the requirements of FCDA was made: "Phare is one point of some importance which deserves attention in this connection, Under the Federal Civil Defense Act of 1950, the primary responsibility for civil defense rests with the States and their political subdivisions, The civil defense program, unlike our military defense program, must be built upon the willingness of State Governors, legislatures, Mayors, and local legislative bodies to support it. If we in the Federal Government are to provide effective leadership, we must present convincing facts to the leaders in the States and cities; we cannot compel their support," 6, If the revised handbook is to serve fully the needs of civil defense, it would appear appropriate to include effects 4nformation for yields within current capabilities, and for adquate planning such information should be provided for probable -6- Appendix alt “A il future capabilities,