. EDPAba le F Seeee Powerful which we are able to build; it. indicates merely the power (the yield) of the specific device tested. While this declassification of the calculable yield of a specific device 1s contrary to paragraph 12b(6) of the Joint AEC-DOD Classifica- | tion Guide, it is not considered necessary to revise the Guide at this time since such revision would apply the declassification . action in this case to all other such weapons or devices. In addition to the yield of the Mike device, the modified Operation Ivy film may also imply that the Mike device was probably not a deliverable device. This is not clear from the picture Since no view of the device itself is shown. The fact that it is on the ground may be explained on the basis of the requirement for extensive scientific measurements, (e.g. the 2 mile helium box), and the size of the "house" door, on the basis of motorized equipment such as cranes. Moreover the deliverability or nondeliverability of the Mike device bears no relationship to whether or not the AEC possesses deliverable thermonuclear weapons, but refers only to a characteristic of the specific device tested. Lastly some of the methods of measuring weapon effects are shown in somewhat greater detail than has heretofore been released. ilowever, much information of this type is already declassifiable involving as it does instrumentation and unclassified techniques which are used for other purposes. . DOE ARCHIVES At present there is no specific plan to show this version of the film other than on an "Official Use Only".basis at the White. However, it is possible House conference of mayors on December 14. that another version will be proposed adapting the material of ‘the film for use in civil defense education and the enlistment of volunteer workers. We would appreciate your comment on such an. There would of course be an opportunity for you to adaptation. see and comment upon it before public release was made. Sincerely yours, /s/ ~ Lewis L. Strauss Chairman . ~ a ~ 3