an rename This report on Operation CASTLE is one of many volumes that are the Product of the NTPR. The DOD Defense Nuclear Agency (DNA), whose Director is the executive agent of the NTPR program, prepared the reports, which are based on the military and technical documents reporting various aspects of each of the tests. The reports of the NTPR provide a public record of the activities and associated radiation exposure risks of DOD personnel for interested former participants and for use.in public health research and Federal policy studies. The information from which this report was compiled was primarily extracted from planning and after-action reports of Joint Task Force 7 (JTF 7) and its subordinate organizations. What was desired were docu- Ments that accurately placed personnel at the test sites so that their degree of exposure to the ionizing radiation resulting from the tests could be assessed. The search for this information was undertaken in archives and libraries of the Federal Government, in special collections Supported by the Federal Government, and, where reasonable, by discussion or review with participants. « For CASTLE, the most important archival source is the Modern Military Branch of the National Archives in Washington. The Naval Archives at the Washington Navy Yard also was helpful, as was the collection of documents assembled by the Air Force Weapons Laboratory (AFWL) Historian, the col- lection now being housed in the AFWL Technical Library at Kirtland Air Force Base, Albuquerque, New Mexico. Other archives searched were the Department of Energy archives at Germantown, Maryland, its Nevada Opera- tions Office archives at Las Vegas, and the archives of the Test Division of the Los Alamos Scientific Laboratory (LASL). JTF 7 exposure records were retrieved from the archives, and an addi-~ tional file of exposure-related documents that had been microfilmed by the Reynolds Electrical and Engineering Company, Inc. was also useful. The major gap in information sources is in primary documentation of personnel movement in areas of potential radiation exposure. 7 This has