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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 Records of the Fifth Army, 1959-1978 in the Records of U.S. Army Operational, Tactical, and Support Organizations (World War II and Thereafter) (Record Group 338) that includes General Order 129 for March 11, 1970 of the 86th USARCOM within Accession # 338-76-0150. For access to and/or copies of these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org. We were unable to locate any records of the 86th in Accessions 338-76-0473 or 338-76-0466.
We hope this is helpful. Best of luck with your research!