Yes, this is him!
Dear Ms. Schomacker,
Thank you for posting your request on History Hub!
Please note that in some states, the National Guard formed coast artillery units to supplement the regular Coast Artillery Corps (CAC), and those National Guard units were often still called Coast Artillery Corps. You may, therefore, need to search both standard military and National Guard sources for information about your great grandfather and the unit he served in.
We searched the National Archives Catalog and located the series General Correspondence, 1901-1918 in the Records of the Chiefs of Arms (Record Group 177) that contains the file 5973 / 6000 - Coast Artillery National Guard: 5975 - South Carolina, which may be of interest to you. We also located the series Records Related to History and Organization, 1908-1922 in Record Group 177 that includes information about the Coast Artillery Corps (CAC). These records have not been digitized. Please contact the National Archives at College Park - Textual Reference (RDT2) at email@example.com for access to and information about these and similar records.
Next, we located 7 series related to the Coast Artillery Corps that were created by the War Department's Coast Artillery Corps in the Records of U.S. Regular Army Mobile Units (Record Group 391) that might contain some relevant information. These records have not been digitized. You may contact RDT2 for assistance with these records.
You may also wish to review the brief history of the War Department's Artillery District of Charleston, South Carolina in the Catalog.
Plus, information about Requesting Copies of Older Military Service Records (pre-1917) is located on the National Archives website.
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. We apologize for this inconvenience and appreciate your understanding and patience.
In addition, for access to personnel records of non-active duty Army National Guard enlisted personnel and officers, please contact Maj. Gen. Roy Van McCarty, Adjutant General of South Carolina via the South Carolina National Guard website as well as information about the history of the South Carolina National Guard.
Finally, please contact the South Carolina Department of Archives and History for further assistance.
We hope this information is helpful. Best of luck with your family research!