Daisy posted this on a similar thread:
https://dodcio.defense.gov/Portals/0/Documents/Library/Memo-UseOfUnclassMobileApps.pdf
MEMORANDUM FOR SENIOR PENTAGON LEADERSHIP
COMMANDERS OF THE COMBATANT COMMANDS
DEFENSE AGENCY AND DOD FIELD ACTIVITY DIRECTORS
SUBJECT: Use of Unclassified Mobile Applications in Department of Defense
...In accordance with DoD Instruction 5200.48, DoD personnel will not use non-DoD
accounts or personal e-mail accounts, messaging systems or other non-public DoD information
systems, except approved or authorized government contractor systems, to conduct official
business involving CUI. In accordance with DoD Instruction 5200.01, DoD personnel will not
use unclassified systems, government-issued or otherwise, for classified national security
information. DoD CIO will continuously consult with all DoD Components to evaluate risks
mobile applications may present to the DoD and update References (m), (n), and (o), as
appropriate.
Attachment 2; Pg 6; Item 4:
10)
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). An Exception to Policy (E2P) request must be
submitted by the appropriate Component for use of an unmanaged messaging app that is
critical to fulfilling mission operations at
https://rmfks.osd.mil/dode2p.
This was from Oct. 6, 2023. Emphasis added.