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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 histories for October - June 1945 of the 403rd Antiaircraft Gun Battalion. For access to these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
Copies of most of the monthly rosters from 1912-43 and 1947-59 for Army units are in the custody of the National Archives at St. Louis, MO. Please contact them for access to these records. The address is the National Archives at St. Louis, ATTN: RL-SL, P.O. Box 38757, St. Louis, MO 63138-0757 and the email address is firstname.lastname@example.org. Rosters for units serving in World War II from 1944-46 were destroyed in accordance with Army disposition authorities.
We hope this information is helpful. Best of luck on your research!