Look for the word CHALLENGE or words based on it.

COMMS

https://twitter.com/NSAGov/status/1345034321871171585

https://twitter.com/DefenseIntel/status/1345022446043361280

https://twitter.com/NatReconOfc/status/1344674420804222976

https://twitter.com/SecPompeo/status/1345172986509275136

https://twitter.com/SecPompeo/status/1345105011588489216

https://twitter.com/SecPompeo/status/1345097467965140993