Dear Ms. de St. Aubin,
Thank you for posting your request on History Hub!
The information you seek should be in his Official Military Personnel File (OMPF). OMPFs and medical records of enlisted men of the U.S. Navy who were separated from the service after 1885 and prior to 1957 are located at NARA’s National Personnel Records Center (NPRC), (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002. To request these records, please mail a completed GSA Standard Form 180 to NPRC. Veterans or next-of-kin of deceased veterans can also use the online order form at vetrecs.archives.gov. For more information, see Official Military Personnel Files (OMPF), Archival Records Requests.
Navy and Marine Corps casualty records from 1940-1989 are in the custody of the National Archives at St. Louis (RL-SL), P.O. Box 38757, St. Louis, MO 63138-1002. For access to these records, please contact RL-SL via letter or email at firstname.lastname@example.org.
If this was an accidental collision, there may have been a court of inquiry. For proceedings of Navy courts of inquiry after 1953, please write to the Office of the Judge Advocate General, United States Navy, 1322 Patterson Avenue, Suite 3000, Washington, DC 20374-5066.
We hope this information is helpful. Best of luck with your family research!