The Air Force announced today the results of two separate unmanned aerial vehicle accident investigations. An Accident Investigation Board checking into the April 18 crash of a Predator UAV during Operation Allied Force has determined "the accident resulted from a combination of mechanical and human factors," according to an Air Combat Command news release today. According to the accident report, "the Predator experienced a fuel problem during its descent into Tuzla (Bosnia). Upon entering instrument meteorological conditions and experiencing aircraft...