problems on Eniwetok Island; surveys to discern special Air Force requirements for CASTLE; finalization of personnel needs and requi- sitioning procedures; and coordination with other task groups in order to keep abreast of the ever-changing concept sc as to adjust accordingly Task Group 7.4 planning where necessary. At the first official staff meeting of Task Group 7.4 on 16 July 1953, it was decided that the headquarters would be organized on a directorate basis under the operational control of AFSWC while in the ZI and wider JTF SEVEN in the forward area. In the PPG the Task Group would assume operational control over three subordinate units--the Test Aircraft Unit, the Test Support Unit (4930th Test Support Group at Eniwetok as part of the garrison force), and the Test Services Unit. The problems which faced the Task Group fcllowing the July activation were variant in terms of importance and peculiarity. Much time was spent solving the very ordinary difficulties concerning personnel, security, organization, logistics, and finances, all of which were experienced by the other task groups and all not necessarily peculiar to the Task Ferce. The most important problems, however, were of an operationai nature. The decision as to sampling aircraft to be used during CASTLE was still outstanding and thus much effort was devoted to the matter during the Summer of 1953. aircraft were studied. As has been previously mentioned, many The following aircraft were ultimately se- lected for achieving scientific objectives: 92