So how does stuff get classified? And who does the classifying?

[haele]

2. Classified documents are serialized.

Both originals and copies are supposed to be logged and checked in/checked out.
Electronic documents can only be accessed in secure spaces that are monitored. Any copies of Secret and above classified information is also logged and checked out by the custodian under specific circumstances and there is a process to handle them if one has permission to remove classified documents.

But Classified documents are always managed in a strict process.

Haele