The Air Force has not identified the root cause of a starter-generator failure that has resulted in the loss of at least 13 of its primary strike remotely piloted aircraft over two years, despite a program office investigation, according to the program's Selected Acquisition Report obtained this week by Inside Defense . Between April 2013 and December 2015, the Air Force tracked 96 starter-generator failures that resulted in the loss of 13 aircraft. The program office conducted a root-cause investigation,...