According to this NY Times article from 2000, the famous rooftop evacuation took place at an apartment building, not the U.S. Embassy:
The World; Getting It Wrong in a Photo
Did something similar happen at the embassy, or did the show's creators make the same mistake as the "people back in the United States [who] just took it for granted that it must be the embassy, because that was where they believed the evacuation took place"?
Or, they took dramatic license.....and made it work for the show.
To sort of answer my own question, I just found this Wikipedia entry:
https://en.wikipedia.org/wiki/Operation_Frequent_Wind
It states that "The U.S. Embassy in Saigon was intended to only be a secondary evacuation point for embassy staff, but it was soon overwhelmed with evacuees and desperate South Vietnamese. The evacuation of the embassy was completed at 07:53 on 30 April, but some Americans chose to stay or were left behind and some 400 third country nationals were left at the embassy."
So apparently there was a famous photograph in which many people mistook an apartment building for the embassy, but there was also an embassy evacuation.
I now return you to your regularly scheduled program.
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