Dear Mr. Rodgers,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series titled World War II Operations Reports, 1940-1948 in the Records of the Adjutant General's Office, 1917 - 1981 (Record Group 407) that may contain records of the 15th Infantry Regiment, 3rd Infantry Division from 15 August 1944 to 15 February 1945. For more information about these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com. We were unable to locate specific records of Company B or 1st Battalion. Records of lower echelon units sometimes were incorporated into the files of the regiment.
Also we suggest that you request morning reports for the unit you are interested in since they may include information on sick, wounded, and similar records. Morning reports for Army units from November 1, 1912 to 1959 are in the custody of the National Archives in St. Louis (RL-SL), 1 Archives Drive, St. Louis, MO 63138-1002. Please contact RL-SL in writing or via email at firstname.lastname@example.org .
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT2 and RL-SL. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your research!