There has been yet another violent attack with mass casualties. This was not the act of a lone gunman, or of an armed student rampaging through a school. It was a group of families en route to a wedding that was killed. The town was called Radda -- not in Colorado, not in Connecticut, but in Yemen. The weapon was not an easy-to-obtain semiautomatic weapon, but missiles fired from U.S. drones. On Thursday, Dec. 12, 17 people were killed, mostly civilians. The London-based Bureau of Investigative Journalism has consistently tracked U.S. drone attacks, recently releasing a report on the six months following President Barack Obama’s major address on drone warfare before the National Defense University (NDU) last May.