Have you tried the Archives? Be aware that many personnel records from WW 1 were destroyed in a fire in St. Louis in the early 1970's. I was looking for records for my grandfather who was at Meuse-Argonne but so far, no luck.
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Dear Mr. Nordin,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 44 series pertaining to the American Expeditionary Forces in North Russia in the Records of the American Expeditionary Forces (World War I) (Record Group 120). One series in particular, Historical Files Relating to North Russia, 7/17/1918 - 8/5/1919 has been microfilmed (M924). For access to the 33 textual series and the M924, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org. For the 11 map-related series, please contact the National Archives at College Park - Cartographic (RDSC) via email at email@example.com.
M924 was digitized by fold3.com and is available online for a fee. Or you may view these digital images via fold3 at one of NARA's facilities for free via ALIC. For the nearest NARA location, please consult our web page at https://www.archives.gov/locations/.
We also searched the Catalog and located 26 series of the American Expeditionary Forces in Siberia in Records of U.S. Army Overseas Operations and Commands, 1898-1942 (Record Group 395). One series, Historical Files, 8/3/1918 - 4/1/1920, has been microfilmed (M917) but not digitized. For access to these 26 series and M917, please contact RDT2 via email at firstname.lastname@example.org.
An article in Prologue (Winter 2002, Vol. 34, No. 4) titled Guarding the Railroad, Taming the Cossacks; The U.S. Army in Russia, 1918–1920 may provide some background information as to why American troops were sent to Russia.
We hope this is helpful. Best of luck with your research!