24 man chain of small but detectable amounts of radioisotopesstill present on theisland. Acknowledgments The success of a mission of this type depends on the cooperation and help of manyindividuals and organizations. Their numberis too large for each to be mentioned, but the authors wish to express their sincere appreciation to them all, andin particular to someof the individuals whose efforts contributed so much to the successful completion of the mission. Dr. Charles L. Dunham andhisstaff of the Division of Biology and Medicine, Atomic Energy Commission, were most helpful in coordination and expedition of arrangements with other governmental agencies. At Brookhaven National Laboratory we are indebted to Dr. Lee E. Farr, Director of the Medical Department, for his guidance andassistance; to Dr. S. W. Lippincott for histopathological interpretation of the skin biopsies; and to Dr. E.P. Cronkite, Dr. V.P. Bond, and Dr. J.S. Robertson for help and advice on various aspects of the program. The Department of Defense and particularly the Departmentofthe Navy,as in the past, contributed mostvitally to the mission. The help ofthe Chief of Naval Operations and Commander, Hawaiian Sea Frontier, in furnishing an LST made possible the examination of the Utirik people and the smooth workingofother transportation arrangements. Weare deeply grateful for the unfailing enthusiasm and assistance of Comdr. I.V. King (MSC) USN of the Naval Medical Research Institute, who acted as the Navy liaison officer throughout the planning and operative stages of the mission. Weare also grateful to Capt. E.O. Van der Aue (MC) USN, Commanding Officer, and Capt. J. Pollard (MC) USN of that Institute for their enthusiastic support. At the Naval Radiological Defense Laboratory Capt. Richard S. Mandelkorn USN and Capt. A.R. Behnke (MC) USNwere helpful. Weare most grateful to Lt. James P. Nolan (MC) USNR,who acted as Navalliaison to our group from the Hawaiian Sea Frontier. His untiring efforts in makinglogistic arrangements and assistance in carrying out physical examinations at Utirik Island were of immeasurable help to the medical team. Also Lt. Al Sprague, USN,of the staff of the Hawaiian Sea Frontier was most helpful in making arrangements for the team at Hawaii. Lt. Comdr. W.E. Smith, USN, Commanding Officer of the LST 859, andhis officers and crew wereof great assistance to the team on the voyage to Utirik. The conning of the ship through the treacherous waters of Utirik Lagoon was evidence of real seamanship. At Kwajalein, Capt. W.C. Short, Jr., USN, Commanding Officer of the Naval Station, and his staff were most helpful to the group. At Majuro weare most grateful to Mr. Maynard Neas, the District Administrator, Dr. A. Hicking, District Health Officer, Mrs. Ruth Mar- tin, Administrator of the Marshall Islands Memo- rial Hospital, and their staff, who were of great assistance in supporting the operation. Wealso wish to express our appreciation to Trigar Ishoda, practitioner, and Nelson, technician, for their assistance in carrying out the examinations. References 1. Cronkite, E.P. et al., The Effects ofIonizing Radiation on Human Beings: A Report on the Marshallese and Amertcans Accidentally Exposed to Radiation from Fallout and a Discussion of Radiation Injury in the Human Being, U.S. GovernmentPrinting Office, Washington, D.C., 1956. 2. Koyoma,Y.et al., /ryo (published by Iryo Dokokai, Medical Affairs Bureau, Ministry of Health and Welfare, Tokyo, Japan) 9, No. 1, 5-45 (1955). 3. Bond, V.P., Conard, R.A. Robertson, J.S., and Weden, E.A. Jr., Medical Examination ofRongelap People Six Months After Exposure to Fallout, WT-937, Operation Castle Addendum Report 4.1A, April 1955. 4. Cronkite, E.P., Dunham, C.L., Griffin, D., McPherson, 8.D., and Woodward, K.T., Twelve-Month Post-Exposure Survey on Marshailese Exposed to Fallout Radiation, BNL 384 (T-71), August 1955. 9. Conard, R.A., Huggins, C.E., Cannon, B., Lowery, A., and Richards, J.B., Medical sur- vey of Marshallese two years after exposure to