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A Predator Drone

A U.S. Predator unmanned drone, shown here on June 13, 2010, is armed with a missile while sitting on the tarmac of Kandahar military airport. U.S. Sen. Rand Paul, R-KY, led a more than 12-hour filibuster on the Senate floor on March 6, 2013, during John Brennan's CIA appointment after the... MASSOUD HOSSAINI/AFP/Getty Images