For their comments on earlier drafts of this report, we would like to thank representatives of the Office of the Special Assistant to the Deputy Secretary of Defense for Gulf War Illnesses, the Department of Health and Human Services, the United States Army Center for Health Promotion and Preventive Medicine, the Office of the Assistant Secretary of Defense (Health Affairs), and the Office of the Joint Chiefs of Staff.

We also express gratitude to the following individuals: Andrew Baum, Ph.D. (University of Pittsburgh Cancer Institute), Ronald C. Kessler, Ph.D. (Department of Health Care Policy, Harvard Medical School), David H. Marlowe, Ph.D. (Walter Reed Army Institute for Research, retired), Herbert Weiner, M.D. (School of Medicine, University of California, Los Angeles), and Kenneth B. Wells, M.D. (RAND). We thank David Persselin and Alan Shafer for their assistance in compiling data.