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Dear Mr. Schneider,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Organizational History Files of Various Army Units, 1920-1972 in the Records of U.S. Army Operational, Tactical, and Support Organizations (World War II and Thereafter) (Record Group 338) and located General Order No. 111 dated 10 September 1962 that includes the XIV Corps Artillery. For access to and/or copies of the general order, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org. Please include this information in your email to RDT2: RG 338, UD-UP 21, Box #1.
We were unable to locate additional information for the 86th ARCOM, XIV Corps, and 323rd Logistical Command within this series. It is possible that further extended searching by you or your representative would eventually yield some pertinent documents. RDT2 will be happy to make appropriate records and/or finding aids available in the Textual Research Room should you have an opportunity to visit the National Archives at College Park.
We hope this is helpful!