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Dear Mr. Wagner,
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 historical records for October to June 1945 and general order for 1942 to 1945 for the 403rd Anti-Aircraft Artillery (AAA) Gun Battalion. The 403rd AAA Battalion was redesigned as the 403rd AAA Gun Battalion on 1 June 1942. 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.
We hope this information is helpful. Best of luck with your family research!