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Dear Mr. Irvine,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 81 series & 112 file units of the 4th Infantry Division; 11 series & 14 file units of the 4th Infantry Division, 3rd Brigade; and 6 file units for the 2nd Battalion, 22nd Infantry in the series After Action Reports, 1965-1972 plus Boxes 450-464 in series Infantry Unit Records, 1965 - ca. 1973 (regardless of Division), all in the Records of the U.S. Forces in Southeast Asia, 1950-1976 (Record Group 472). For access to and/or copies of these records, please contact the National Archives at College Park -Textual Reference (RDT2) via email at firstname.lastname@example.org.
We hope this is helpful. Best of luck with your research!