A visit to Carlisle is usually time well spent. Of course, no one source has all the answers but every little bit helps; brings you closer to the "whole story". You can also write but they implemented a fee schedule a while back that's pretty much of a gamble. Your inquiry is assigned to a researcher - many of whom are volunteers. The researcher makes copies of what he/she assumes will satisfy you and sends them out. Results are very often disappointing. I'm unaware whether they charge a fee for personal visits but you'll find that out when you get there. You want to contact the division veterans association as soon as you can. His best buddy or a guy who stood guard with him regularly or shared a tent or foxhole may still be alive - but these guys aren't getting any younger. Good luck!