They are displaying their point of view through this memo or demand on their employees.
They consider the reading of leaked NSA documents on a public computer to be a leak as well. This makes a person who clicks on a link to be a leaker themselves, which is ridiculous (and stinks of legal excessive assertion).
They are also basically asking employees to report against themselves for doing this.
What this specifically means to a NSA employee is a guess at this point.
Maybe the leaked slide contradicts whatever view the employer created for the NSA employee (whatever view they have towards their own job), however that is just a 1st guess.
Either way, it appears that management is trying to manage something that is unmanageable. So, the best they can do is formally discourage the action.
Ironically, the memo probably generates more interest and (asserted) violations than it prevents. Who doesn't want to know the truth behind their own occupation?
Hopefully these cats (employees) won't get (figuratively) killed for their curiosity.
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