Did you solve your problem with the ABMC War Dead Search website? (I've never had any problem with it but you never know.) Have you ordered (and recieved) your subject's deceased file?
The website includes only names and information on those who are interred in American Battle Monuments Commission (ABMC) Cemeteries overseas or the National Memorial Cemetery of the Pacific in Hawaii. Also includes names, etc., of individuals who disappeared - MIA or otherwise - and whose names are inscribed on memorials located in the above cemeteries. If you're subject individual isn't listed, this usually means that his/her remains were returned to the United States for burial.