[sk2020]

According to at least one person, not very promising.

https://www.hackerfactor.com/blog/index.php?/archives/896-To...

About 13 years ago, another researcher identified some suspicious patterns on the network.

https://web.archive.org/web/20070618001928/http://jadeserpen...

Also, it just doesn't seem very likely that the US DoD would fund a network which defeats their own surveillance efforts.

Being "anonymous" online is more a question of being anonymous from who's perspective. Fooling a sysadmin is easy. Fooling an ISP is hard. Fooling an NSA contractor is probably near impossible. I think you can achieve reasonable plausible deniability with enough inconvenience, though. Get rid of your smartphone, compartmentalize your activity, never enable JS, use public wifi, spoof your MAC, make a tinfoil hat, etc.