Dr. Leo P. Brophy holds an A.B. degree from Franklin and Marshall College and M.A. and Ph.D. degrees in history from Fordham University. After teaching history and sociology at Fordham and Seton Hall Universities, he joined the staff of the Chemical Corps Historical Office in 1945. He has specialized in administrative and logistic history. Since 1953 Dr. Brophy has served as Chief of the Chemical Corps Historical Office. He is coauthor of The Chemical Warfare Service: Organizing for War. Dr. Wyndham D. Miles has an M.S. degree in organic chemistry from The Pennsylvania State University and a Ph.D. in History of Science from Harvard. After working in industry as a research chemist, and teaching chemistry at The Pennsylvania State University, he joined the staff of the Chemical Corps Historical Office in 1953. Dr. Rexmond C. Cochrane obtained a Ph.D. in English Literature from Columbia University and was a member of the Chemical Corps Historical Office from 1945 until 1948. After teaching at Indiana University and the University of Virginia, he returned to the Historical Office as a consultant historian. He is at present a Research Associate in the Department of History, University of Maryland.