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One of the ways you might find out this information is by requesting your father's military personnel service record. If your father has died, you can request it yourself, otherwise your father needs to be the one to request the records. In the first case, you'll need either a death certificate, a letter from the funeral home, or a published obituary as proof of passing.
To find out more information about requesting military service records see here: Military Service Records.
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You may want to request his Official Military Personnel File. If your father was separated, discharged, or died in service 62 years prior to today's date, his OMPF is completely open to the public and anyone may request the record. In order to request his record, complete a Standard Form 180 and mail it to:
National Personnel Records Center
1 Archives Dr.
St. Louis, MO 63138