common defense and security since it does not give any indication as to how such a device is designed or built or any indication asp to how it operates, Moreover, the yield of Mike is well . within that which our foremost scientists have often openly 4S , pate Feaeenialeaeaaotc7 ee aid ee discussed as being possible (e.g. "a thousand times more powerful. than the Hiroshima bomb" -- H.A. Bethe). Moreover, the observed yield of any particular device does not in any way imply that such a device is the most powerful or least 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 is contrary to paragraph 12b(6) of the Joint AEC-DOD Classification 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, DOE ARCHIVES 3. 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 basisof 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, The Los Alamos scientists do not object to the release of this item of information, a judgment in which the Office of Classification concurs, since the deliverability or non-deliverability of the Mike device pears no relationship to whether or not the AEC possesses de- liverable thermonuclear weapons, but refers only to a characteristic of the specific device tested, ¢