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.
I’ll never not be angry about the EU not developing their own OS/Distro, but using US software with backdoors. It is just insane. Yes, it probably would cost a few hundred millions extra, but a fighter jet also costs 100-130 million € and a safe OS is so extremly more important than a couple of extra fighter jets…