Gen. John Hyten, head of U.S. Strategic Command, said Tuesday he signed off on guidance last week to dictate how to engage with unmanned aerial vehicles spotted near weapons facilities in the United States. At a Senate Armed Services Committee hearing , Hyten appeared to characterize the March 31 guidance as a preemptive move in case more advanced UAVs start flying near sensitive domestic areas. "So far, they've been incidental activities," he told Sen. Deb Fischer (R-NE). "But the fact...