4th Brigade WWI AEF Marine Service Numbers have nothing to do with time in service or the date you joined. If you give me an AEF WWI Marine Service Number, I can tell you what Regiment and Battalion he was in (and maybe Company), or if he was a replacement.
I caught on when I saw numerous Battalion Scout Snipers with consecutive Serial Numbers without regard to their Enlistment date.
The Marines were smarter than I thought. If a Marine found another wounded Marine, he would know exactly to what unit the wounded Marine belonged.
Semper Fi,
JimInformation
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