The Italian defense organization - Army, Navy and Air Force - is migrating 150,000 desktops from various flavors of MS Office to LibreOffice and ODF, in one single large project coordinated by a mixed group of soldiers and community members. The first shift will migrate 55,000 desktops in 2016, while the remaining 95,000 will be migrated during the following four years. So far, the combined project team has trained a group of 32 trainers and support professionals, and the trainers have done the first short training to Rome based division IT managers. The presentation will tell about the odd relationship between an extremely structured organization and a loosely tied community, which have learned to trust each other and to work together to reach a single objective. Also, it will explain the technical activity for the integration of LibreOffice with the three different document management systems.