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Hello Mr. Vann,
Thank you for contacting the History Hub!
We would recommend first browsing the U.S. World War II Navy Muster Rolls, 1938-1949 and U.S., Department of Veterans Affairs BIRLS Death File, 1850-2010 which can be accessed on Ancestry.com. This website may charge a fee, but you may be able to access it for free at a local library. If you come to a National Archives location you can use our computers for no charge in one of our research rooms.
You may be able to request Navy Official Military Personnel Files (OMPF) from the National Archives in St. Louis depending on when they were discharged from service. These records are releasable to the public when the date of separation becomes 62 years from today’s date. You may view these original records or request copies for a fee. We recommend contacting the St. Louis location to make an inquiry.
National Archives and Records Administration
National Archives at St. Louis
PO Box 38757
St. Louis, MO 63138
Merchant Marine service records are held by the U.S. Coast Guard’s National Maritime Center.
USCG-National Maritime Center (NMC-421)
ATTN: Correspondence Section
100 Forbes Drive
Martinsburg, WV 25404
We hope this information is useful and best of luck with your research!