We would like to thank The Honorable Bernard D. Rosker, Under Secretary of Defense for Personnel and Readiness and Special Assistant to the Deputy Secretary of Defense for Gulf War Illnesses, for sponsoring this effort. We would also like to thank Lieutenant General Dale A. Vesser (Ret.), Deputy to the Special Assistant for Gulf War Illnesses; Colonel Michael H. Abreu, USA, Director, Investigations and Analysis Division; and Anne Davis, former Director, Investigations and Analysis Division for their support of this work.

We are indebted to many of the personnel at OSAGWI who assisted us. In particular, John Sarles facilitated our day-to-day coordination within OSAGWI; Marie Danco, William Voelkner, Roy Crosse, and the entire staff of the OSAGWI Veterans Data Management team helped us track and locate difficult-to-reach veterans; Richard Harrington, Mike Veasey, and the OSAGWI Case Management Action Team (CMAT) staff obtained veteran contact information; Roxanna Baylor of CMAT provided us with day-to-day assistance in coordinating the various locating activities; and Bob Menig helped oversee the Office of Management and Budget approval process.

In addition, Jack Sabia, Ken Martin, and Gaylon Smith of the OSAGWI Modeling and Data Analysis group provided invaluable assistance in defining the locations of various units, conducting initial data analysis, and providing detailed quantitative and qualitative information about the data and the Gulf War. Lieutenant Colonel Steve Williams, Jack Dennison, and William Bradford of the OSAGWI Environmental and Occupational Exposures Division, and Dr. Michael E. Kilpatrick, Medical Outreach and Issues, provided us with a great deal of background information on military pesticides and general pesticide research and information.

Don Hakenson, Judy Donahue, Robert Swartwout, and First Lieutenant RaeAnne Swanson, USAF, of the United States Armed Services Center for Unit Records Research compiled and provided much of the data used to build the sampling frame. Jackie Howard at the Center for Health Promotion and Preventive Medicine provided the geographic information system expertise and did much of the work of linking military units to cities.

The original Gulf War database was compiled at the Defense Manpower Data Center (DMDC). Mike Dove and Scott Seggerman of DMDC provided invaluable assistance and quick response to our requests for supplemental data. Anita Lancaster and her staff provided support and guidance on issues related to obtaining the necessary survey approvals.

Last, and certainly not least, we would be remiss if we did not recognize our many RAND colleagues who helped us in this endeavor. These include Gary Cecchine, Ross Anthony, and Beatrice Golomb, who provided many valuable comments on this work and assisted us with some of the finer technical points; Dan McCaffrey, Matt Schonlau, and many other members of the RAND Statistics Group, who were very generous with their time and advice on statistical matters; and, our reviewers, John Adams, Sandra Berry, and Tim Dickens, who provided invaluable guidance through their insightful comments.

Any errors or omissions are the sole responsibility of the authors.