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Dear Mr. Isaacson,
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, 1905-1981 (Record Group 407) and located After Action Reports for September 1944 - May 1945 of the 253rd Armored Field Artillery Battalion. For access to and/or copies of these reports, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
We hope this is helpful. Best of luck with your research!