Pentagon working on hummingbird-sized spy drones

A new Pentagon project aims to produce unmanned nano aerial vehicles that can be launched by soldiers in crowded urban areas to spy on enemy positions. Soldiers fighting future battleble to launch hummingbird-sized uns in crowded urban areas will be amanned nano aerial vehicles — or NAVs – capable of carrying sophisticated sensors and flying through open windows in buildings to report back on enemy positions. A new project partly funded by the Defense Advanced Research Projects Agency (DARPA) called the Nano Aerial Vehicle (NAV) program aims to develop an extremely small, ultra-lightweight aerial vehicle for urban military missions that can fly both indoors and outdoors and that is capable of climbing and descending vertically as well as flying sideways left and right. DARPA says the NAV program pushes the limits of aerodynamic and power conversion efficiency, endurance and maneuverability for very small air vehicle systems.