Turkey is out of the F-35 Program, they insisted on the F-35 and persisted in their attempt to acquire the Russian SAM SU-400. In acquiring both Russia & Turkey would gain access to critical software in the F-35 systems that would not discriminate in identifying NATO "Friends or "Foes." The best theory as to why is that the Sultan wanted to be able to shoot down his own in the event of a coup. Nice Ally you got there NATO. The silver lining is frees up a lot of parts & money slated for the Turkish program.