~~ Riauiey RE: aoa ~ 4, Lastly some of the methods of measuring weapon effects are shown in somewhat greater detail than has heretofore been released, However, Los Alamos has advised that there would be no objection to the release of this information. In fact much 4 aoe it does instrumentation and unclassified techniques which are _ ' wr information of this type is already declassifiable involving as a used for other purposes, 5. The teletype setting forth the position of the Los Alamos Laboratory with respect to the film discussed above is attached as Appendix "D" to this paper, It is to be noted that the references in the teletype to the Curtiss and the "Bhangmeters" are now irrelevant since those sequences have been deleted from the film. DOE ARCHIVES 6. The Division of Information Services calls attention to difficulties in relations with public media which it believes are likely to follow continued withholding of the filmfrom public exhibition after it has been declassified as recommended by this paper, - On some past occasions for various reasons it has been decided not to make public release of in- formation determined to contain no Restricted Data. However, in no such instance has the declassified information been given, as is intended in this case, by communication to a group of public leaders under an Official Use Only marking. 7- Communication of declassified material on H-weapons to a fairly numerous group of public leaders such as Mayors would almost certainly assure that the most impressive facts given the group would soon become public through speeches and press, radio and television interviews after these officials return to their home cities; and that the source of the facts would become public. ~6- pce 9