This narrative has been revised based on new information provided to the Office of the Special Assistant for Gulf War Illnesses, Medical Readiness, and Military Deployments since we published the interim version of this paper on November 5, 1998. Additionally, we reassessed all incidents according to our investigation and assessment methodology, which we updated based on comments from the Presidential Special Oversight Board for Department of Defense Investigations of Gulf War Chemical and Biological Incidents. This Board was chartered to perform oversight and overall evaluation of the Department of Defense’s investigations of Gulf War chemical and biological agent, environmental, and other health issues.^[310]

• For some incidents and discussions of related issues, we added documentary information and excerpts from new interviews to present more complete evidence.
• For each incident discussion, we included an analysis section and shifted to this section analytical observations that appeared in other sections in the interim case narrative. Additionally, we expanded, clarified, or amended analytical discussion for previously published incident summaries where appropriate.
• We added estimated wind direction and speed to all of the incident maps.
• We added the new incident Q and added substantially to incidents F, I, and J based on new information received from veterans following publication of the interim case narrative.
• We determined two incidents discussed in the body of the interim narrative did not involve 11th Marines potential chemical warfare incidents; these we moved to Tab D.
• Assessments regarding CWA presence for incidents C and O changed from unlikely to indeterminate based on insufficient information in accordance with our revised methodology.
• We adjusted the assessments of incidents A and B from unlikely to definitely not regarding CWA presence, as a result of additional interviews and judgment.

We revised and updated our lessons learned recommendations, hopefully making them more useful to the services and organizations that will consider them.

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