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Dear Mr. Bridges,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and locates a series titled Aviation Unit Records, ca. 1965 - ca. 1973 in the Records of the U.S. Forces in Southeast Asia (Record Group 472). This series includes the S-3 (operational) Daily Journals for May - July 1970 and the Organizational History files for 1965-1971 of the 227th Aviation Battalion (Boxes 491 & 501). We also located the series titled After Action Reports, 1965 - 1972 that includes reports of the 1st Air Cavalry. Both of these series are part of 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 information is helpful. Best of luck with your research!