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You have to file a DD Form 149 with the military records corrections board. That board has the power to alter a discharge status and the reenlistment codes related to that discharge.
However, to obtain an upgrade, your husband would have to prove that the discharge status and codes that he received were an error or an injustice, at the time he got them.
There is not an automatic right or process for discharge upgrades, and in fact, they are intended to be permanent reflections of the period of time. Neither the passage of time or good behavior allow for an upgrade.
Only proof of an error or injustice in the record allows for one.
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