There may be clues in this 18 page doc?
Post-World War II Intelligence America’s Secret Vanguard: US Army Intelligence Operations in Germany, 1944–47 Thomas Boghardt
https://www.c i a.gov/library/center-for-the-study-of-intelligence/csi-publications/csi-studies/studies/vol-57-no-2/pdfs/Boghardt-Secret%20Vanguard.pdf