Are there people in the U.S. government who might bring a laptop home, say, and connect it to a LAN at their house? What about an official who connects to a government computer from home but has perhaps had a Trojan-horse keystroke logger installed on his home machine. I'm sure things are much better protected now than they were before the "hackers' war" in 2001, but still.... There are many ways to skin a cat. [And, notwithstanding the "hackers' war," this isn't about the defacement of web sites.]
Several years ago, I was working for a defense contractor, & an utter NITWIT used his manager's laptop to do classified work on, in the office, because his PC was being replaced. He wasn't supposed to be doing classified work on his own either, but he was too lazy to walk down the hall to the secure computer room which had NO external connections. When the security officer found out about it,