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Dear Mr. Plunkett,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled U.S. Army Discharge Reports, ca. 1917 - 1920 in Record Group 64 that includes records pertaining to Camp Upton in boxes 25 & 26. For access to these records, please contact the National Archives at St. Louis (RL-SL) via email at firstname.lastname@example.org.
We hope this is helpful. Best of luck with your research!
Many thanks for your reply and for leading me in the right direction. Your knowledge is unsurpassed. Until my next coundrum,