Dear Mr. Adrian,
Thank you for posting your request on History Hub!
For U.S. Revenue Cutter Service personnel records prior to December 31, 1897, please contact the National Archives at Washington, DC (RDT1) via email at email@example.com.
The medical records and Official Military Personnel Files (OMPFs) of the personnel of the U.S. Coast Guard (including the U.S. Revenue Cutter Service) who were separated from service after 1897 and prior to April 1999 are located at NARA's National Personnel Records Center, (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002. A GSA Standard Form 180 should be used to request these records.
We hope this information is helpful. Best of luck with your research!