This report on Operation CASTLE is one of many volumes that a product of the NTPR. The DOD Defense Nuclear Agency (DNA), whose is the executive agent of the NTPR program, prepared the reports, are based on the military and technical documents reporting vario of each of the tests. The reports of the NTPR provide a public r the activities and associated radiation exposure risks of DOD per for interested former participants and for use in public health r and Federal policy studies. The information from which this report was compiled was prima tracted from planning and after-action reports of Joint Task Force (JTF 7) and its subordinate organizations. What was desired were ments that accurately placed personnel at the test sites so that degree of exposure to the ionizing radiation resulting from the t could be assessed. The search for this information was undertake archives and libraries of the Federal Government, in special coll supported by the Federal Government, and, where reasonable, by di or review with participants. t For CASTLE, the most important archival source is the Modern Branch of the National Archives in Washington. The Naval Archive Washington Navy Yard also was helpful, as was the collection of d assembled by the Air Force Weapons Laboratory (AFWL) Historian, ¢t lection now being housed in the AFWL Technical Library at Kirtlan Force Base, Albuquerque, New Mexico. Other archives searched wer Department of Energy archives at Germantown, Maryland, its Nevadaj Opera- tions Office archives at Las Vegas, and the archives of the Test Pivision of the Los Alamos Scientific Laboratory (LASL). JTF 7 exposure records were retrieved from the archives, and fn additional file of exposure-related documents that had been microfilmed by the Reynolds Electrical and Engineering Company, Inc. was also usefull The major gap in information sources is in primary documentation of personnel movement in areas of potential radiation exposure. 7 Thihas