Defense analysts say the Air Force's reconsideration of what should follow the legacy E-8C Joint Surveillance Target Attack Radar System is driven by the strategy and budget concerns of a new slate of Pentagon leaders, who worry key command-and-control aircraft could be shot down by advanced foreign adversaries. Experts believe the military faces two kinds of wars: the low-technology, diffuse and urban conflict posed by the Islamic State of Iraq and Syria and the high-end, concentrated threat posed by Russia...