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Dear Mr. Schneider,
Thank you for posting your request on History Hub!
According to the National Archives Catalog, the series titled Subject Files, 1963 - 1963 in RG 389 is arranged according to the Army Functional Filing System (TAFFS), and thereunder alphabetically by subject. This filing system replaced the War Department Decimal File System in 1962. As the Scope & Content note indicates, this series contains files which document the organization and administration of the Security and Investigation Division of the Office of the Provost Marshal General. Of note are accreditation files (a.k.a. personnel or 201 files) for military police criminal investigators (MPCI) who served with the Division from the early 1950's to 1963. Also attached to the series description are 134 file units and these are also searchable.
Under TAFFS 205-01 were filed publication instructions for various Army regulations and bulletins such as the Retired Army Personnel Bulletin.
Under TAFFS 403-17, the SID clerk filed “transmittals of MPCI credentials” in alphabetical order by the last name of the individual that was the subject of the transmittal. These are the files you may be interested in. As indicated in the series description, these file units may contain personal information subject to the provisions of the Freedom of Information Act (b)(6) and they may need to be screened by NARA personnel before possible release.
For access to these files, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
We hope this information is helpful. Best of luck with your research!
Thank you Mrs. Collier