The Austrian military didn’t just adopt LibreOffice; they actually contributed back to it. Over five person-years of development work went into adding features they needed. Those improvements are now available to everyone using LibreOffice, which is pretty cool.
While I’m glad to see M$ Office being replaced with LibreOffice, I hope the governments and companies doing so, also channel funds into development.
I’d assume they would probably hire a few developers to get the things they specifically need into the software.