As to records, the National Archives in Washington has many records of the SS seized at the end of World War 2. The problem is unless you are in the DC area and can spend the time digging through the files yourself it can be very difficult to locate any information. I believe most of the Waffen-SS records are held at the College Park, Maryland facility of the National Archives.
Another option would be the German State Archive-BundesArchivs
Postfach, 79024 Freiburg
Phone: ++ (0761) 47817-0
Fax: ++ (0761) 47817-900
Also they may not have been SS, almost everyone in Germany from the postman to gamekeepers to miners besides the military wore a uniform. Can you post or send a photo? That would help dtermine rank and branch and give a little better idea of where to go.