In response to the request of a friend, David Gordon writes:

There isn’t a collection of Murray’s articles on the Vietnam War, although he frequently wrote about it, e.g., here.

The best way to find his articles would be to go through the Rothbard bibliography, looking for titles that mention Vietnam.

Also, Murray often commented on the war in The Libertarian Forum.

The Best of Llewellyn H. Rockwell, Jr.