This is true, but lacks specificity. Do you think CISA would recommend sharing details of imminent military operations via signal?

Where? They recommended it for members of the public as part of their general recommendation for end-to-end encryption but that’s a very different scenario than government employees who have official systems.

[citation needed]

Assuming this is true, how did they determine what a "top" government official is? So if you're the SecDef you should use it but not the deputy SecDef? How would this guidance not pertain to all government officials?