British Army bomb-dropping UFOs to deploy
This little UAV is capable of surveillance missions and even drop a (grenade-sized) explosive device into locations like building interiors. Small and without external blades, it could sneak-in via by a window. I suspect that surveillance is going to be the primary use (yup with HD video and all). Right now, it runs on gas, which is quite noisy, but there is hope that a future electric engine could make it quiet enough to do some serious espionage missions.