Expand exact roster rank codes (rank_final: S/Sgt -> Staff Sergeant; class_rank: S/Sgt -> Staff Sergeant)
Remove NG / negative research-note markers; keep other roster facts
 
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== Research notes ==
== Research notes ==
* NG Class 18 7A
* Class 18 7A
* 8/21/1919-
* 8/21/1919-