In Brussels this week, two former U.S. drone technicians are speaking out against the aerial bombing program as the European Parliament gears up for a hearing on unmanned warfare and the U.S. prepares to confront its own legacy on drone strikes.At an event with campaigners on Thursday, Cian Westmoreland and Lisa Ling, who worked on the military's drone technology systems, criticized the bombing program for what they say was a lack of recognition for human life.