Signal

Signal is the most secure messaging app that has ever existed. No government (including the US) has been able to defeat it.

When information leaves JWICS or SIPRNET (in an encrypted format) in order to transit the clearnet links between sites is it still considered classified?

No. No it is not. Otherwise, the topology of these networks would not allow them function outside of siloed isolation.

Black/Red, learn this concept. It never traversed anywhere in an unencrypted state.

Highly classified information transits the exact same pathways your regular internet traffic does. How else do you think networks like JWICS and SIPR maintain global connectivity?

It is, of course, properly encrypted to ensure confidentiality, integrity and authenticity.

^^^^^^^^^This is so threatening to the losers at Google/youtube that they'll remove it without cause. Pass it around far and wide, email chains, social media, reddit.. its the truth and is factually verifiable. This is another democrat hoax