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Dear Mr. Nelson,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Engineer Unit Records, ca. 1965 - ca. 1973 in the Records of the U.S. Forces in Southeast Asia (Record Group 472) that includes an organizational history of the 517th Engineer Company for 1967-1970. For access to and/or copies of these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
We hope this is helpful. Best of luck with your research!