The invention of the Radar, a device capable of tracking objects without visual means many kilometers away, allows further development of many branches of military technology. The branch that benefits most, for now, is aircraft. We get the next generation of airplanes - the Fighter and the Bomber. We also get the new Paratrooper infantry, capable of airdropping into enemy territory. Finally, in Brave New World we get the advanced city infrastructure for air travel - the Airport.