Build a large scale robotic 3D printer that can fabricate shelters using local materials and some specialized.
Buildings would contain all systems required by a relocated or refugee population with water, sewage, electrical, air handling, foundations, and shelter systems. System would be able to produce multiple shelter in rapid succession to address need. Other robotic systems would lay infrastructure like pipe, electrical, and roads.
Objective is produce housing and environment within hours of an event in all terrains, weather, and locations.
Also useful to reduce footprint of us movement. System can build housing, barracks, defense points on fly (and remove).