Cost overruns of more than $1 billion for modernizing F-35C Joint Strike Fighters are creating financial headwinds for the follow-on development of the fifth-generation aircraft, acting Chief of Naval Operations Admiral Lisa Franchetti told lawmakers Thursday. “Tech Refresh-3, the hardware foundation for delivering Block 4 capabilities through C2D2 methodology, has exceeded $1B in cost overruns and remains well behind schedule,” Franchetti said in written responses to advance policy questions posed by the Senate Armed Services Committee considering her nomination to...