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Dear Mr. Schneider,
Thank you for posting your request on History Hub!
We searched the Records of the Army Staff (Record Group 319), the Records of U.S. Army Operational, Tactical, and Support Organizations (World War II and Thereafter) (Record Group 338) but were unable to locate records of the 49th Military History Detachment or a history of the 86th ARCOM.
We also searched the internet and located various publications pertaining to the 86th U.S. Army Reserve Command on WorldCat that may be of interest to you..
We hope this is helpful. Best of luck with your research!