 The missiles are used in combination with new technology intended to increase accuracy and expand surveillance, including the use of small, unarmed surveillance drones to exactly pinpoint the location of targets.These "micro-UAVs" (unmanned aerial vehicles) can be roughly the size of a pizza platter and meant to monitor potential targets at close range, for hours or days at a time.One former U.S. official who worked with micro-UAVs said that they can be almost impossible to detect at night.