Rapid environmental changes due to climate change call for innovative technological approaches, and likewise is this required for security missions. Essentially, organizations like NATO need advanced capabilities allowing geographically distributed joint mission forces with all their information sources and consumers to (i) operate off the same map and (ii) get the right data at the right moment. Datacubes, aka spatio-temporally homogenized raster data, are an accepted cornerstone for providing Big Geo Data easier for users and applications, ready for analysis, visualization, fusion, etc. Recently, NATO has started a project exploiting Big Earth Datacube Analytics for transnational security and Environment protection. A series of relevant use cases will be established proving the capabilities of realtime datacube management, analytics, and federation of fixed and moving data sources and sinks. We present background, mission, and thrust of the project.