NATO. Dr. Wigner felt the proposed extensionof exchange with the British, in this field, would still lead to only a diluted cdoperation , and asked about exchange of intelligence information on the Russian shots. : It was pointed out that -the intelligence teas have dooperated very closely. a 3 a Dr. Libby returned to a point he had raised in previous nstngs Russian Y-235 7 the. Committee, namely his grave doubt that: the Russians have u-235 and production facilities for it (since their. diffusion plant has not been: seen). Dr. Fisk argued that information ‘not available to the Gac ies evidence of a Russian diffusion plant; andDr. Rabi reviewed the evidence) | At 12130 p.m, this session was adjourned, SECOND SESSION (November 4, 1953) | oe | od ee oS ad Ab Li 30 p.m. the Committee met with Gen, Fields, Gol. Vv. G, Huston, Dr. Ne Be Bradbury, Dr. H. F, York, and Dr. Smyth, - Mr. viarrey snd Me. Campbell entered a few minutes later, All members of the GAC were The Secretary and Mr. Tomei were: al.s0 present. Gen. Fields reviewed the planning for Operation Castle. sasha, diysh aaRrR WF leitSg Atbedetcotstyhandede Castle Plans q faba, ik present. & Wea.on Matters