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Dear Mr. Godfrey,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a file unit titled Unit Histories: 135th Assault Helicopter Company that is part of a series titled Organizational History Files, 1959 - 1973 in the Records of the U.S. Army, Pacific (Record Group 550). We also located a file unit titled Air Assaults/Assault Helicopter Companies in the series titled After Action Reports, 1965 - 1972 and organizational files of the 135th in a series titled Aviation Unit Records, ca. 1965 - ca. 1973, both series are 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 information is helpful. Best of luck with your research!