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Hello, Mr. Freader,
Thank you for contacting the History Hub!
You may request a DD 256, Honorable Discharge Certificate, by submitting a SF–180 Form. In your request, state that you were never issued this certificate. Since you were in the Marine Corps and released from active duty in 1975, please send your completed form to the National Personnel Records Center, (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002.
We hope this information is useful and best of luck with your research!