diation field for use in tactical or emergency situations and is based on the consideration that it will be received as an exception. The CASTLE RadSafe Plan was designed to meet the requirements of the rule dose as modified by agreements with the authorities in the radiological field. However, due to the special nature of a field test such as Operation CASTLE, it was recognized that a policy of strict adherence to the radiological standards prescribed for routine laboratory or industrial use was not realistic. The intent of the CASTLE plan was to reach a reasonable and safe compromise considering conservation of personnel exposures, the international import of the tests, and the cost aspects of delays due to excessive radiological precautions. The effort established criteria for waiv- er of the MPE in certain cases, taking full consideration of the safety of the individual and the nesd fcr completion of the CASTLE mission. The MPE waiver provision was cleared with and approved by the Surgeons General of the three Services, and the Directcr, Division of Biology and Medicine, AEC. ° In reference to the protection of Task Force personnel from ra~ diation exposure, the basic plan was built on the premise that Eni-wetok Atoll was the primary base of operations and Bikini was the forward shot area. Thus, personnel in the Bikini area were com- pletely evacuated (except for the firing party during" sH#o7-/ ) and disposition of all ships was made s5 that perscnnel would be in the most favorable position with respect to the wind pattern and fallout area, and at a sufficient distance so as to be 3afe from