Dear Ms. Clark,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series Enlistment Papers, 1798 - October 31, 1912 and Registers of Enlistments in the United States Army, 1798 - 1914 (M233) in the Records of the Adjutant General's Office, 1762 - 1917 (Record Group 94) that include military service files of the Regular Army. For information about the non-digitized Enlistment Papers and M233, please contact the National Archives at Washington, DC - Textual Reference (RDT1) via email at email@example.com.
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 RDT1. We apologize for this inconvenience and appreciate your understanding and patience.
M233 has been digitized and is available on Fold3 as Army Register of Enlistments, 1798-1914; on Ancestry as U.S. Army, Register of Enlistments, 1798-1914; and on FamilySearch as United States Registers of Enlistments in the U.S. Army, 1798-1914. There may be a fee for using Ancestry. Instead, please check for access at your local library as many library systems subscribe to these sites, making them free for their patrons.
You also may wish to view the History Hub blog on Pre-World War I US Army Service Records.
We hope this is helpful. Best of luck with your family research!