House lawmakers questioned a panel of experts yesterday about the poor performance and ballooning costs of Pentagon weapons programs, focusing many of their comments on the F-35 Joint Strike Fighter, which has struggled for years with cost, schedule and performance issues. Rep. Glenn Grothman (R-WI), chairman of the House Oversight and Accountability national security, the border and foreign affairs subcommittee, said Congress should do more to rein in poorly performing Pentagon programs. “We must implement stronger oversight and enforcement mechanisms...