dv. Communications: A preliminary investigation into the CASTLE requirements of the Scientific Task Group was conducted utilizing the experience of Edgerton, Germeshausen and Grier as well as lessons learned on previous — operations. An early agreement was reached that this contractor should plan on procuring and eventually operating a Forward Area communication link between Eniwetok and Bikini Atolls and in addition provide radio equipment for inter-island support. This problem received the coopera- tion and understanding of the J-5 of HQ JIF SEVEN and immediate steps were taken to meet the requirement. all communications planning: Three basic considerations governed rapid and reliable means of communications, security, and avoidance of interference. Ce Sampling Aircraft: . A number of conferences were held to determine the scope of sampling activities necessary and the type of bomb debris samples to be procured. These conferences resulted in a compilation of the entire sampling problem with recommendations as to altitudes desired and was placed in the form of a study forvarded to Joint. Task Force. The close cooperation of staff officers of the air Task Group was of material assistance in this problem. d. Department of Defense Participation: - Through representatives of Armed Forces Special Weapons Project the Department of Defense presented ita plan of participation with a view of conducting a military effects program in connection vith CASTLE. Because of the limited information on specific yields and locations this DOD participation was initially presented in a broad form of objectives. Subsequent to this presentation, all discussions at the laboratory which focused towards final determination of specific shot}’ yields and locations took into planning objectives of the DOD programs.