A US military GPS-jamming exercise has been linked to a medevac plane crash that killed four people in the mountains of New Mexico. The twin-engine Beechcraft King Air was flying from Roswell to Ruidoso in early May to collect a patient when its pilots suddenly lost access to their modern navigation systems. It was a clear, nearly moonless night, leaving the crew with few visual references as they flew over the dark and sparsely populated landscape. But about 100 miles away, military personnel were testing technology designed to disrupt GPS signals during an electronic warfare event at White Sands Missile...