The Austrian Armed Forces have been preparing for the switch to LibreOffice for a long time. Other LibreOffice users will also benefit from this.
Archived version: https://archive.is/newest/https://www.heise.de/en/news/Austria-s-armed-forces-switch-to-LibreOffice-10660761.html
Similarly in France the “Gendarmerie nationale”, a branch of the French Armed Forces that do the police has been using “GendBuntu” on all their desktop since 2008.
It’s a version of Ubuntu developed specifically for them.