All outgoing email filters are configured to looks for keywords.
In the case of all government agencies associated with National Defense they looks at the destination domain AND for classification markings.
However, if the classification markings were stripped, or the information underwent a human translation and rewording, the filter will not see it.
Thus, no fire alarms or bells.
It’s certain that there was a conspiracy to circumvent Security Protocols and Methods, at the very least.
Yeah, like Drone isn’t a key word?