According to unnamed counterterrorism officials, in 2009 or 2010 CIA drones began employing smaller missiles in airstrikes in Pakistan in order to reduce civilian casualties. The new missiles, called the Small Smart Weapon or Scorpion, are reportedly about the size of a violin case (21 inches long) and weigh 16 kg. 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. "It can be outside your window and you won't hear a whisper," the official said.[102] The drone operators also have changed to trying to target insurgents in vehicles rather than residences to reduce the chances of civilian casualties.