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Dear Ms. Lerner,
Thank you for posting your follow-up 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 23 December 1944 to 12 May 1945, s-2/s-3 journals & files for 24 December 1944 to 13 May 1945 and general orders for 1942-1944.
We also searched the U.S. Allied Commission for Austria (USACA) in the Records of U.S. Occupation Headquarters, World War II (Record Group 260) and located a series titled Records of Field Office Linz, 1945 - 1950 that contain information pertaining to your father.
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. None of these records have been digitized and posted to NARA’s web site.
For a listing of concentration camp liberators, please refer to this web page at https://www.ushmm.org/collections/bibliography/liberators
We hope this information is helpful. Best of luck with your research!