Dear Mr. Hatch,
Thank you for posting your request on History Hub!
Copies of most of the monthly rosters from November 1912 - 1943 for Army units are in the custody of the National Archives at St. Louis, MO. For access to these records, please write to 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.
Also, we searched the National Archives Catalog and located General Records, 1919 - 1951; General Orders, 1921 - 1935; and Special Orders, 1931 - 1935 in the Records of the Office of the Chief of Engineers (Record Group 77) which were created by the Engineer School. For more information about these records, please contact National Archives at College Park - Textual Reference (RDT2) via email at Archives2reference@nara.gov.
Photographs of various military activities are in the custody of NARA's Still Picture Branch (RDSS) to request a search for photographs of a specific organization, please contact RDSS at firstname.lastname@example.org. Please note that not all individuals and units were photographed and had their photographs preserved in the official records, and not all photographs that were taken have captions identifying each person in the photograph.
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 RL-SL, RDT2, and RDSS. We apologize for this inconvenience and appreciate your understanding and patience.
In addition, we suggest that you contact the U.S. Army Corps of Engineers Office of History located at the Humphreys Engineer Center in what is now Fort Belvoir, Virginia, and the U.S. Army Engineer Museum at Fort Leonard Wood, Missouri.
We hope this is helpful. Best of luck with your family research!