drewp

So I was flipping through this official PDF announcement, more clearly summarized in this article, and I noticed a part about how "proposals submitted ... will be classified at the SECRET level". Then there's what looks like some standard language about how to handle secret data:

Classified information at the Confidential and Secret level may be mailed via appropriate U.S. Postal Service methods (e.g., (USPS) Registered Mail or USPS Express Mail). All classified information will be enclosed in opaque inner and outer covers and double wrapped. The inner envelope shall be sealed and plainly marked with the assigned classification and addresses of both sender and addressee. ...

Remember, these proposals are about technologies for scanning entire buildings through their walls, but just double-wrap your goverment secrets in opaque covers and we're cool.