communicate directly on an unclassified basis with the British Joint Services Mission, Overation HARDTACK 20, Preliminary plans are continuing for Operation HARDTACK, tentatively scheduled for the spring of 1958, at the Eniwetok Proving Ground. DELETED Research and Developnent Facilities el, Los flamos, New Mexico. struction of the Sigma building. Bids were received for conTne low bid was in excess of the authorization and an increase in euthorization was reauested, ccmpleted this building will ‘replace the i Tne estimated total cost of the building is $5.1 million, When inadequate and temporary fecilities now being used for weapons reseerch and develoment work. mr 2e, Livermore, California. expansion of facilities meey Te Planning continued on the in the Livermore area, ed 23. At the end of June desig was 40 percent complete and construction started on the weaponization facilities to be used by the Sandia Corporaticn.