Acknowledgments The professional debts of the Brookhaven National Laboratory Marshall Islands medical program are many, but particularly to be acknowledgedare the following: Mr. Roger Ray. His long acquaintance with and sincere concern for the Marshallese people has helped foster a medical program which will benefit the exposed Marshallese for many more years. Dr. Jacob Robbins, Chief of the Clinical Endocrinology Branch, the NationalInstitutes of Health, continues to provide the medical program with exacting guidance in matters relating to clinical endocrinology. The medical program continues to benefit from the highly competent efforts of the Department of Energy Pacific Area Support Office (William J. Stanley, Harry U. Brown, William D. Jackson). Their ability to manage logistic and political details so necessary for an effective and unencumbered medical program has been outstanding. Captain Keith Coberly and the crew of LiktanurII are entrusted with the safety and well being of the medical teams for much of each mission. That trust has been well earned; their efforts have been exemplary and extend far beyond those to be expected. The assistance of Ms. Geraldine Callister, whose enthusiasm and familiarity with the secretarial requirements of the medical program are so essential, ts gratefully acknowledged. Dr. Dr. Brown Dobyns, Professor of Surgery, Case Western Reserve University, Cleveland, OH, by his personal and professional commitment in assisting the exposed Marshallese with thyroid problems requiring surgery, remains an invaluable resource to the medical program. Dr. P. Reed Larsen, Director of the Thyroid Diagnostic Laboratory, the Brigham and Women’s Hospital, Boston, MA, makes available to the program endocrinologic testing of the highest quality. Dr. Beverly Morgan, Professor and Chairperson, Department of Pediatrics, the University of California (Irvine), has personally and through her medical staff contributed enormously to an effective effortin pediatric care for the children of Rongelap and Utirik. Robert Aronson kindly developed a computer- ized format for listing the references. Mrs. Mary Rustad has again competently guided a Mar- shall Islands report to completion. Dr. Victor Bond,in reviewing the manuscript, continues to add to an already long and notable record of supportfor the program. Acknowledged with particular pleasure is the Deputy for Pacific Operation, D.O.E. (Nevada), 13