Dear. Mr. Schneider,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series titled Records of the XIV Corps, 1964 - 1966 in the Records of U.S. Army Operational, Tactical, and Support Organizations (World War II and Thereafter) ( Record Group 338) but were unable to locate any memorandums of the HQ, XIV Corps.
We hope this is helpful.