" 12, Consideration was given to Limiting the CASTLE progran to a mascienum of four shots and deferring the remaining tests to a later operation. While this wuld be favorable fron the point of view of simplifying and shortening the CASTLE Operation, it would not be consistent with the maxeSenu effort toward thermomclear progress, It would also involve greater expense inherent in two separate operations. | As to the relative difficulty of seven versus six shots, it now apwars that a seventh shot wuld be feasible, at reasonable cost in tine, dllars, and efforts, if the barge technique used for tho shots proves favor- Cr able enough for extension to an Waa’tional barge shot at essentially tha sane site, Radiation hazard of these over-water shots appears sufficiently low to permit firing at the close tine intere vals anticipated. The instrunentation mounted on the islands could, if not danaged, service three shots probably as well as ty, 13. The CASTLE progran recorzended in this paper is believed to be the naximn practiceble prograt. It covers all available possibilities for providing an emergency capability and should fure nish an excellent basis for the future develoment of thermonuclear weaDoOns.