The US government doesn't use the "Tor" network for encrypted
communications...
It uses its own separate networks, including "Skynet"-type of satellite ones,
who are not open to "civilian" use.
The "Tor" network is something only used by people who think they're going to
escape the US or some other government's surveillance, by using such provenly
insecure communications network.
(Which might indeed work, to escape surveillance in less developed countries,
who are not capable of intercepting and decrypting the communications in
question - but, that won't work, if you're trying to escape surveillance from
a government that the US one might be willing to pass on information to.)
