A U.S. Predator unmanned drone armed with a missile sits on the tarmac of Kandahar military airport in Afghanistan in June 2010. Defense Secretary Leon E. Panetta has praised the Predator for its precision-targeting ability, which minimizes collateral damage. (Associated Press)

A U.S. Predator unmanned drone armed with a missile sits on the tarmac of Kandahar military airport in Afghanistan in June 2010. Defense Secretary Leon E. Panetta has praised the Predator for its precision-targeting ability, which minimizes collateral damage. (Associated Press)