This narrative was initially published on February 24, 2000. Since then, the Office of the Special Assistant for Gulf War Illnesses has not received any new information on the material presented, nor have any additional leads developed to change the narrative’s assessments. Additionally, the Presidential Special Oversight Board reviewed the narrative and recommended that we republish it as final. The only changes to the paper are:

• Deleted a reference to Fox MM-1 spectrometers being poor detectors for mustard vapor because there is no empirical data to support this statement.
  
• Added information clarifying how the Fox MM-1 can display relative intensities exceeding 100%.
  
• Edited the paper to meet current editorial standards.

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