‘ 408483 sists 0 ao Shis document con A lt. . Copy LL. ee wane 137&th AEC 5, Letter to the President qomerding Project MILLRACH and Additional | Meeting b 528-58 snots 8 tor Operation H. General Starbird discussed with the Commaissicners the question of including additional shots in Operation HARDTACK. (451-1958 matcly eight megatons of fission yleld would be contributed tu the COLLECTION RG B26 - Hie of The Secretary than Mr. ldbby's original caiculations. atmosphere by the shots already approved for operation HARDTACK, General Starbird replicd that the total figures for the amount of fission that would be spread world-wide was now somewhat higher Box no.2OS_(NN 3 -326=93—070) rotpen MRA W 7 Hadtack vol: 3 General Starbird then reviewed the additional shots to be included in HARDTACK and said their contribution to the atmosphere of fallout would not be significant. However, 1f one of the contingency shots now being considered for HARDTACK 1s included, q there might necessarily be an increase in Mr, Libby's calculations on fallout from the teat. During the preceding discussion, Col. Sherrill loft the neeting briefly. Mr. Potts said he believed Mr, Libby's original calculations incladed figures on the pronused ecntLagency shot and expressed surprise that there was a considerable inerenzse in the estimated figures on HARDTACK fallout, At this point, Mr, Grahan Icft the meeting briefly. Referring to a chart, General Starbird explained in detail ———— r REPOSITORY NARA - Co(leye Pa Mr. Ploberg commented that Ur. Libby had calculatedthat approxi- the size of the proposed additional shots and contingency shots as weil aa the estimated world-wide fallout from these shots, Pe Epa BEST COPY AVAILASLE DEPARTMENTOF FREBUYDET IST REVIEW-DATI: S-24-95° AUTHORITY: DAOC IMIDE Fanp ft fs NAME: Leh,Kaiweee | 4: 2ND REVIEW-DATU: SekZ~yt J . BDoivre AUTHORITY; ADD Passe Name: Bab shanorgtr gegen He wiles ! BRS a ' >