https://www.archives.gov/files/research/jfk/releases/docid-32159212.pdf
It seems he used VON MOHRENSCHILDT... or is this for someone else with a Polish passport issued 10/30/37 in Belgium?
https://www.archives.gov/files/research/jfk/releases/104-10006-10248.pdf
Cale Allen, DOD Case Officer in 1963 - Requested to contact G.D. in April 29, 1963 - https://www.archives.gov/files/research/jfk/releases/104-10112-10444.pdf