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Dear Mr. Butenschoen,
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 a 63-page history of the 66th Armored Regiment that includes lists of casualties but not of the entire unit. For access to and/or copies of the history, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
Copies of most of the monthly rosters from 1912-43 and 1947-59 for Army units (including Army Air Corps) are in the custody of the National Archives at St. Louis (RL-SL). For access to these records, please contact the National Archives at St. Louis, ATTN: RL-SL, P.O. Box 38757, St. Louis, MO 63138-0757 or via email at email@example.com. 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 with your research!