of firing at either Eniwetok or Bikini (small-yield devices for Eniwetok) had to be established. If weather were bad at Bikini and good at Eniwetok, for example, then much time would be saved if a choice of shooting at either atoll were possible. and S¥Yor6 threes, Two shots, were planned for Eniwetok and the remaining ~s SHo7S 3, 4| Ald S- (see next paragraph) were plannea ¢.~ Bikini with the provision that if weather were not satisfactory over a period of time at Bikini the possibility of firing additional shots at Eniwetok would be considered. Fur- ther, certain alternatives were included taking into account weather factors and the possible utilization of both atolls on an interchangeable basis. The third shot in the series, 7 April on Eninman Island at Bikini. successful S07 3, was detonated on The test of this device was _and as a result the jevice, » Was cancelled from the program, thus reducing CASTLE to a six~shot operation. the unexpected stecess ot the Shor ) device was cancelled and a revised a ; » called SHo7S (already referred to, i¢ Also, since . was added. The SHo7 4 device was detonated successfully on 26 April and although S#o7 G@ was planned to follow that shot, poor weather conditions at Eniwetck made it necessary to fire Swo7 § at Bikini “n 5 May with SA#o7G finally being fired on 1, May. The 14 May 139