So I am on another wiki link clicking adventure and happened upon the US Postal Service page. I noticed that Department of Defense classified documents, up to the SECRET level, are sent via Registered Mail.
So, are the envelopes marked classified or something?
If they are marked classified, what is to stop some nefarious person from mimicing whatever method is used and sending do-bad things via the mail?
What happens if a piece of this mail happens to get mutilated?