"That's one small step for a man, one giant leap for mankind" (Neil Armstrong)
These words are now firmly established in the history of space travel, and at least according to his bio, was concocted by himself during his journey to the moon. But why was he allowed to do this (apparently without any supervision/approval by his employer, NASA)?
The entire Apollo 11 mission was planned in detail, and they intentionally broadcasted the historic moment live, so there's no doubt that this was a huge publicity stunt for NASA (and by extension the United States). Why didn't anybody think to have a script prepared by someone on the ground in advance so as to make most use of the moment? Nixon even had a speech ready in case something went wrong and the astronauts died; surely someone could have prepared an equally elegant speech for the greatest achievement of mankind. It's interesting because that moment on television probably had the widest audience reach ever; they could've used that moment to spread whatever propaganda they wanted and have it be heard by most of mankind.
...I mean what if the first words to come out of his mouth were "Hail Hydra"? That would've been a catastrophic embarrassment for the US.