The Pentagon is disputing figures used by the Government Accountability Office in determining that an increase in Air Force F-35 Joint Strike Fighter purchases would add billions of dollars in cost increases to the program's already hefty price tag. The Defense Department's proposal to accelerate JSF purchases by 169 aircraft between fiscal years 2010 and 2015 could add as much as $33.4 billion to procurement funding, according to a GAO report released late this week. However, in a March 5...