You have to be able to find the person to serve him. Once you do, he may get the case stayed due to service on active duty.
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You can ask him.
You can send him a demand letter.
You can hire a lawyer to send a letter.
You can sue him.
You can let the debt slide.
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You can sue
You should see if this is something to be done in Smalls Claims court.
If he is still in the military and you get a court judgment DFAS will garnish his military pay.
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You can certainly sue. Recommend filing a claim in a small claims court, jurisdiction (amount of $ you can claim varies state to state). Small claims court generally has very relaxed rules and most claimants aren't represented by lawyers. This allows you to pay a small filing fee ($50-$300), and keep all that you are awarded in a judgement from the court. Sometimes a letter from a lawyer to the offending party is all you need to "remind" your "friend" of his obligations...which can negate the necessity for a lawsuit...which is never a quick option.