It's probably Element with a different logo and different colors.

why would you want to see the screenshots of an application used by the German military which is basically a fork of another app with plenty of screenshots on its own webpage?

this is just a blog announcement of something cool they're doing behind the scenes and that you will never use in a trillion years, not an Apple product launch

you can see screenies on the app stores: https://play.google.com/store/apps/details?id=de.bwi.messeng... etc