Upon receipt of the high altitude requirements for B-36 and F-84G aircraft from CJI'F SEVENOperations Order No. 1-53, the use of the T-1 High Altitude Suit for crew members was studied. It was deter- mined that for flights above 45,000 feet the suits would be necessary. This meant that only B~36 sampler personnel wuld be re- quired to wear them. Water-escape tests were also run in mid-Sep-— tember on the lead vests to be worn by the F-84G sampler pilots. The tests proved successful both from a radiologiszal and flight safety standpoint. Communications and electronics requirements, though late in becoming known, did not constitute great difficulty for Task Group 7.4. The bulk of the facilities needed for CASTLE had been re- tained in place from IVY so that the only problem encountered was in moving Task Group 7.4 equipment from Kwajalein to Fniwetok. Further, by being located at Fniwetok, Task Group 7.4 received ex' tensive support from the more complete and permanent facilities of Task Group 7.2. During the fall months the subject of aircraft pesitioning for the shots was the mtter of extensive coordination between Task Group 7.4 and Task Group 7.1. At a Los Alamos meeting in August it was determined that Task Group 7.1 would be responsible for determining the positioning of the aircraft during CASTLE as had been the case during IVY. The Air Ferce Task Group Commander was to be charged with the operational aspects of controlling the aircraft. A September meeting further established the procedures to be fol- 94