The Air Force is analyzing its options for ramping up F-35 production beyond what is currently programmed over the next five years, but the service's top uniformed acquisition officer said this week that a steep incline to an annual 60-jet buy is unlikely under existing budget constraints. Service officials have said the Air Force would like to get to a sustained annual buy-rate of about 60 F-35 jets as soon as possible and have labeled the ramp-up the service's top...