My mother was with an SS Headquarters unit that surrendered to American forces in Austria in 1945. She said once that she was in the same POW camp as the future Pope Benedict XVI. Germany was paying her a pension until the day she died. She never spoke much about specifics and she has passed on now, but I have always wondered what unit she was with. As a POW, I'm sure that records exist somewhere. My question is where would be the best place to find the answer?
You may also want to cross-post this to /r/genealogy who might have more experience in tracking down family records.
Hello there! As your question is related to looking for identification/information regarding military personnel, our Guide on Military Identification may be of use to you. It provides a number of different resources, including how to request service records from a number of national agencies around the world, as well as graphical aids to assist in deciphering rank, unit, and other forms of badges or insignia. While the users here may still be able to lend you more assistance, hopefully this will provide a good place to start!
The International Red Cross has those records. WWI has been scanned and indexed. For WWII, though:
Unfortunately we are currently unable to process requests for information about individuals who were registered by the Central Prisoners of War Agency during the Second World War.
As it is our first priority – and at the core of the ICRC’s mandate – to devote human and financial resources to addressing urgent humanitarian needs, it is no longer possible to process requests until further notice.
The page linked above gives other potential sources for the information you're looking for.