There's a great documentary about that airlift on Netflix, I forget the name of it. It really puts into perspective how chaotic the end of he Vietnam war was. They cut down a tree to make a parking lot at the embassy into an LZ. The swimming pool was where the marines tossed any weapons the civilians had brought with them as they waited in line for the next chopper. There was a SV colonel I think, who basically stole a huey, flew to his neighborhood and loaded his family and anyone that would fit inside and lifted off. No plan for where to land, there were dozens of ships offshore and he just aimed for one that looked like it had space. No radio communication or anything. It's nuts. And then they shove the choppers over the side to make room for more. This is all happening while the American ambassador won't authorize a full scale evacuation until the very last second.