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Dear Mr. Taylor,
Thank you for posting your request on History Hub!
The units titled 2nd Depot Division and the Field Artillery, Bordeaux Casual Company No. 83 were used by the U.S. Army as holding units for servicemen to be mustered into their operation units after training and out of their operation units once the conflict was over. Neither one of these units were permanent placements for soldiers and therefore, were not the unit your relative actually served in during WWI.
We hope this information is helpful.