The link below opens the article "Easter Sunday at Vinh Long" that appeared in the Smithsonian Air & Space magazine. (https://www.airspacemag.com/military-aviation/vinh-long-easter-sunday-battle-180970805/) This posting is with the permission of the author James Chiles. He also wrote a book on the social history of helicopters, "The God Machine."
Easter Sunday at Vinh Long