Combat vehicles have risen in prominence as the need for ground or atmospheric based combat grew, as once self-unified races began to fought other races of the Milky Way for dominance or defense. For many races, military might is a driving force to advance the science, and such is true with military vehicles; new armors and the discovery of stellar metals and their types have allowed new armor plating to be added onto vehicles and propulsion tech such as anti-gravity has made mobility easy without the expensive need for fuel and fuselages. Many spacecraft are engineered to work in an atmospheric environment, and ground-based vehicles such as tanks, whether tread-powered or even hovering, have made debut in recent wars.