system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does an organization like NASA have the need to classify documents? Why are their findings not made public immediately?
gpt
For something, it is because it is dual-use technology that in this case is both peaceful and military usage.

So they do not what to give everything away about rockest because North Korea and others could use it in their missile program. So it is a good idea to keep some parts secret.

Another reason is that stuff they use like the Falcon 9 that hopefully will launch astronauts to space tomorrow is a designed owned by a private company Space X that do not like their designs spread around. So NASA reports do not contain confidential information from them.

On the other hand, if you look at the data from science missions in space most of them today have the data public on the web almost directly.