INTRODU STION Undertaken at a time when atmospheric testing of nuclear weapons or devices had been discontinued fcr more than two years, this monograph was to be a record of nuclear cloud sampling. Prior to completion of the compilation of documents, interviews, and the writing of the narratives, the Russians had started atmospheric testing and the United States had resorted to underground testing, As this history was concluded, DOMINIC was underway and the sampling story contimed, From the opening chapters the transition is toward a "problemsolving" attitude. The problems which appear in the early tests are not the problems of later tests; the solutions to the problems of the later tests appear to have potential future use, therefore they are discussed in detail, Emphasis has been placed on presenting the solutions to problems unique to the sampling effort, Nevertheless, the chronicling of the cloud sampling effort cannot be completely divorced from the entire nuclear testing activities, Basically, the text contains information which all of those directly associated with nuclear cloud sampling or with decontamination af.aircraft should have knowledge. It is hoped that a study such as this will result in an increase in the understanding of the need for nuclear cloud sampling; thatin turn, will result in an increase in the "motivation" level of those called upon for participation in future sampling efforts, Except in such sections as are inherently technical in nature, a concerted effort has been made to reduce technical terms and phraseology ii AFWLINO SWEH -2-003h \X