Signal is used for things like "get to a SCIF to discuss" or "what do you want from Starbucks?"
It is not to be used for any non-public information:
> Unmanaged 'messaging apps,' including any app with a chat feature, regardless of the primary function, are NOT authorized to access, transmit, process non-public DoD information. This includes but is not limited to messaging, gaming, and social media apps. (i.e., iMessage, WhatsApps, Signal).
https://dodcio.defense.gov/Portals/0/Documents/Library/Memo-...
Sorry but it's clear that in addition to — again — skirting the substance of the conversation, your barometer for just how security-conscious these types of organizations are is completely out of whack.
If you think the CIA’s own SOE goes against the CIA’s own guidelines, then yes there is indeed somebody tremendously, fabulously, loudly ignorant about how securities conscious these organisations are. That’s not me either.
If you work at a healthcare organization, you may have Slack, but that doesn't necessarily mean you can message people's PHI.
At a financial institution, you may have email, but that doesn't necessarily mean you can email PII.
At CIA, you may have Signal, but that doesn't mean you can discuss ongoing military operations in it.
I have already linked to policy that explicitly says non-public DoD information is not approved for Signal.
I find it literally not believable that you don't understand this concept, so I'll have to chalk this one up to motivated reasoning damaging your ability to interpret English.
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“So that we’re clear, one of the first things that happened when I was confirmed as CIA director was Signal was loaded onto my computer at the CIA, as it is for most CIA officers,” Ratcliffe said. “One of the first things that I was briefed on very early, senator, by the CIA Records Management folks was the use of Signal as a permissible work use. It is. That is a practice that preceded the previous administration to the [former President Joe] Biden administration.”