It would not be possible in the limited time available to determine all of the contributors to this report. It is based largely on data provided by programs, projects, task units, and staff sections and was assembled by the Task Group staff. The following are contributing authors whose efforts are greatly appreciated: Rodney L. Aamodt William P. Ball Paul R. Byerly, Jr. Armand W. Kelly Walter T. Kerwin, Jr. Neil E. Kingsley Walton L. Carlson Edward A. Martell Stirling A. Colgate Robert B. Cruise Duncan Curry, Jr. Byron G. MacNabb Richard J, Pitzer Donald I. Prickett Robert H. Campbell John C. Clark Loris M. Gardner James L. Gaylord Walter D. Gibbins Huntington K. Gilbert Herbert E, Grier Nathaniel C. Hallett Marshall G. Holloway Philip L. Hooper Arthur J. Hudgins Jack G. John W. Lipp Buford A. Mangum Owen A. Roberts John D. Servis Jamie L. Shumway Ralph Carlisle Smith Kenneth Street, Jr. Robert J. VanGemert Jacob J. Wechsler Robert S. White Paul R. Wignall James Commancer, TG 7.1 Copled/DOE L, J-Div, ale ny rite A In connection with the Scientific Task Group's planning for and participation in Operation Castle, I wish to acknowledge the overall direction and invaluable advice of Alvin C. Graves, J-Division Leader, LASL, and Deputy for Scientific Matters, Joint Task Force SEVEN. <feM ACKNOWLEDGEMENT