You can do what James indicated but the processing time is quite lengthy.
.A quick solution would be togo to an Army/Navy store or any store that sells military items........ also many outdoor flea markets sell military items, arrowheads, battle stars, medals etc.
Another source would be to contactthe local Veterans of Foreign Wars or the American Legion organizations, they have personnel who handle these problems.If he is disabled there is also the Disabled American Veterans Association.
In the classified advertisements in the Veterans of Foreign Wars Magazine there are various mail order companies where you can order military items......one company is: VETS SUPPLY LINE,10650 CO. RD. 81, #131....MAPLE GROVE, MN 55369
another vendor, MEDALS of AMERICA, Web Store is at< www.usmedals.com>
Both are listed in the Veterans of Foreign Wars Magazine pages 54 & 55.I never did any business with them but you can e-mail themfor availability, cost and shipping fees.