Your problem is this. There is no way to predict how or where a deceased active duty service man will be buried. If he was buried in a military cemetery overseas or in Hawaii he would show up on the web site for the American Battle Monuments Commission. But,he could be buried in any of the US military cemeteries which are run by the Veteran's Administration or the Department of Defense. There are web sites with indexes for these places, too. Or, he could have been returned to his family who would bury him as they chose. In this case there would be no federal government records of where that was. You would have to contact any family he had. I am not certain about this, but, I think when an active duty service man dies the state that he calls home produces a death certificate for the family even tho' he died elsewhere. If this is so and the serviceman was brought home for burial the certificate should show the place of interment.