Probably because the craft that were just in orbit could be considered “in flight” for their entire duration.
Aircraft in flight are considered under the jurisdiction of the country they took off from. So if the spacecraft started in Florida, landed in international waters, and was recovered by a US vehicle, then the astronauts never technically left the jurisdiction of the United States.
But because Apollo 11 did land somewhere, it could be argued they ended the first flight and began a second one when they took off. Due to this, they had left US jurisdiction as they landed and left the vehicle. This means they left the country, and need to go through immigration.
It’s also a piece of the official paper trail that helps to prove to other nations that the US did land on the moon, and that placing the flag in the moon was symbolic and not an attempt to annex the moon. If Apollo 11 had claimed the moon as US territory, then they wouldn’t have needed to fill out immigration papers.
Probably because the craft that were just in orbit could be considered “in flight” for their entire duration.
Aircraft in flight are considered under the jurisdiction of the country they took off from. So if the spacecraft started in Florida, landed in international waters, and was recovered by a US vehicle, then the astronauts never technically left the jurisdiction of the United States.
But because Apollo 11 did land somewhere, it could be argued they ended the first flight and began a second one when they took off. Due to this, they had left US jurisdiction as they landed and left the vehicle. This means they left the country, and need to go through immigration.
It’s also a piece of the official paper trail that helps to prove to other nations that the US did land on the moon, and that placing the flag in the moon was symbolic and not an attempt to annex the moon. If Apollo 11 had claimed the moon as US territory, then they wouldn’t have needed to fill out immigration papers.
That does all make sense. Especially the part about showing the world (especially the USSR) that the moon was not part of the U.S.
Not all of them landed, and the section they returned to earth in never landed either.
This is all about the novelty.