The Pentagon's top weapons buyer told a Senate panel today the Air Force and Navy variants of the F-35 Joint Strike Fighter will not reach the fleet until 2016, a two-year delay for the Navy and a three-year difference from the time line the air service was planning on just months ago. The Marine Corps variant remains slated to reach the fleet in 2012. Pentagon acquisition chief Ashton Carter told the Senate Armed Services Committee during a hearing on the...