Sorry for the delay in getting back to you. If you go to my research pages at:
You'll find the address for the National Military Personnel Records Center. Try writing them (SF Form 80s are on the webpage to download) with as much info as possible. Also, contact the US Army Center for Military History - they can probably put you on the right track to more info. Do you know what camp he was in? There are a lot of WWII POW associations that can help. The national Archives should also have info on him. If you can send a picture of any documents you have, I might be able to provide more assistance. You can write me at firstname.lastname@example.org. Good luck!