[Ref. needed]
Not approved for non-public DOD information: https://dodcio.defense.gov/Portals/0/Documents/Library/Memo-...
The DOD memo does not supersede other DOD instructions referenced by the memo requiring RMF and NIAP things.
> Adopt a free messaging application for secure communications that guarantees end-to-end encryption, such as Signal or similar apps. CISA recommends an end-to-end encrypted messaging app that is compatible with both iPhone and Android operating systems, allowing for text message interoperability across platforms.
https://www.cisa.gov/sites/default/files/2024-12/guidance-mo...