Similar platform that was best in security and became enterprise only. Our Dod switched to it early in the Ukraine conflict. It has enterprise controls on the contacts list and retention. But even that is only secure as the phone itself. Hegseth was just a lower level officer in some National Guard unit so he may have never heard of Wickr, much less any of T47's National Insecurity Clowncar.
The United States Air Force is the air service branch of the United States Armed Forces and is one of the eight uniformed services of the United States.
Using Wickr RAM in Cloud One allows our personnel and teams to collaborate securely at the tactical edge and higher; in-garrison and deployed. Its ability to run on many different platforms and its feature set enables us to reduce security risks and operate successfully. Wickr RAM fills distinct secure mobility collaboration gaps to meet DoD compliance mandates at scale. Based on its commercial and government hosting, scalability, and federation capabilities, it is the only compliant solution that enables secure foreign partner, other government agency, and non-government agency secure collaboration for rapid response operations and ad-hoc activities. This is especially key to enable humanitarian efforts, crisis response, and other operations. Its bot system also enables automation for automatic data collection and communications.
Todd Weiser, Chief Technology Officer U.S. Air Force Special Operations Command
https://wickr.com/secure-communication-for-the-military/
I researched these type of apps as a consultant. Wickr was the most secure but based on usernames and password, which users dislike. Signal, Whatsapp and Telegram can use phone contacts and don't really have log ins and are much more popular.