At the very beginning of the 11th Marines investigation, we numbered the potential NBC incidents based on what we then understood was their time sequence. Before long, we discovered additional incidents to investigate. To avoid changing incident numbers frequently, we designated new incidents with letter extensions so that, for example, incidents 8A and 8B followed incident 8. A few incidents with adjusted dates or times retained their original number but were no longer in sequence. We used these number/letter designations throughout the initial investigation and referred to them in some cited lead sheets to clarify what events interviewees discussed. In 1997, we also shared preliminary data on these incidents with the Presidential Advisory Committee on Gulf War Veterans’ Illnesses using our original numbering. Before we published the interim version of the narrative, we converted the initial numbers into sequential letters in the narrative. As we prepared to publish this final version of the narrative, we needed to set aside two of the previously published incidents as not valid 11th Marines events (brief rationale was added to Tab D on set aside activity), and added one new incident. This resulted in a modified series of sequential letter designations for incidents in the final report. The following table summarizes the evolution of incident serialization.

Incidents in Body of Narrative	Not 11th Marines NBC Threat (Tab D)
Final Report Serial Interim Report Serial Original Serial A A 1 B B 2 C C 3 D D 5A E E 11A F F 5 G G 8 H I 8B I J 9 J K 10 K L 11 L M 12 M N 13 N O 14 O P 15 P Q 17 Q None None	Final Report Serial Interim Report Serial Original Serial S U 1A T V 4 U Z 6 V W 7 W H 8A X X 16 Y R 18 Z Y 19

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