I'm glad this has come up because it forced me to dig a little. Nerd stuff: the Navy uses Azure, virtual desktops for the masses being a new (this year) thing. The Army's cloud is AWS. The Air Force cloud is something different. Wickr is supposed to operate across the platforms.
How much IT/ computer interoperability have y'all experienced between the services? You have a CAC? Great. Can you use that for every network? Nope. Some of that is good IT management or maybe a tech limitation. Don't know, don't care but consider using this joint app across different (and competing) cloud services in an environment where there is no single logon or authentication across domains.
And each branch has its own budget for its own cloud. Installation, operations, and maintenance.
It is a Friday so only 1/3 of my peers are here, but no one's heard of Wickr. Now this all makes sense.
Good thing that 20+ years of GWOT taught us how to be Joint. At least our GAL can see email from other branches though it is usually dated. Little victories, I guess?