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Dear Mr. Hayward,
Thank you for posting your request on History Hub!
The National Archives at College Park - Textual Reference (RDT2) has some listings of Army and Air Force installations via the Army Post Office (APOs) and Navy installations and ships via the Fleet Post Office (FPOs). Reference copies of Army station lists up to 1970 and Air Force station lists as well as a listing of FPOs for War World II onward may be viewed in the Textual Research Room (Room 2000) at the National Archives at College Park, MD. In addition, there is a listing of APOs compiled by a private researcher this is available in Room 2000 for the public to use. APOs for Vietnam consist of five digits and begin with number 96. Please contact RDT2 via email at email@example.com with any questions you may have.
Also, you may want to take a look at the book titled Where We Were in Vietnam: A Comprehensive Guide to the Firebases and Military Installations, and Naval Vessels of the Vietnam War by Michael Kelley as it might contain information relevant to your research.
We hope this information is helpful. Best of luck with your research!