You should send for the IDPF's for those you have service numbers for.Someone will probably give you the address but if not, phone the Department of the Army, tell the person you want to request these files through the Freedom of Information Act and they will give you an address. The address I have has been changed.
Because you are requesting files that are not family related they may charge you for the copies.It takes at least six months to receive the files.
Have you searched the web for the group?
I'm sure you will be getting some good advice from others on the site.Good luck and don't give up.