2005 is not the 20th anniversary of 1975
An NPR story on the fall of Saigon in 1975 has this quote:
NPR Senior Foreign Editor Loren Jenkins witnessed the fall of Saigon. He wrote this essay in 2005 to mark the 20th anniversary.
The year 1995 is the 20th anniversary in question, whereas 2005 is the 30th anniversary. Thanks to Dan Drake for pointing out this story to me. Just in case the typo is corrected in a future edited version, I have attached a screenshot of the relevant quote below. Enjoy.