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Dear Mr. Passelecq,
Thank you for posting your request on History Hub!
We searched the World War II Operations Reports, 1940-1948 in the Records of the Adjutant General's Office (Record Group 407) and located after action report for December 1944 of the 52nd Armored Infantry Battalion, 9th Armored Division. For access to and/or copies of the report, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
We hope this is helpful. Best of luck with your research!