Drones already give troops valuable data about enemies and devastated areas, but the existing vehicles have their limits; big aerial drones can't see inside buildings, and their ground-based counterparts can't get over rough terrain. Well, CyPhy Works might just have reached a happy balance between those two extremes. It recently signed a deal with the US Air Force to produce the Extreme Access Pocket Flyer, a very tiny UAV (it weighs just 2.8oz) that sends HD video to soldiers for up to two hours. The key to its portability is a 250-foot microfilament tether that delivers both power and data -- bulkier gear like batteries will stay with the soldier. This has the upshot of adding reliability and security, since there's no wireless signal subject to interference or jamming.