Go to Veterans’ Affairs immediately with paper work.
and was the extra pay in Poland correct? Perhaps they are saying he was overpaid? Is Poland officially a combat zone, or a location for which extra pay is paid? If not, they are probably correcting an erroneous overpayment.
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In any case, they are doing a terrible job of explaining what happened.
Submit a claim to the Board of Military Records Correction with a copy of his form DD 214 and any other documentation such as copies of orders, etc and request that the records be corrected and the claim for pay overage be dismissed.