A sniper crouches near an open window and zooms in on his target, who sits a half-mile away. He peers through a scope and holds his breath, preparing to squeeze the trigger. But it’s windy outside, and he can't afford a miss. What to do? A new DARPA-funded electro-optical system will calculate the ballistics for him, telling him where to aim and ensuring a perfect shot, no matter the weather conditions. Lockheed Martin won a $6.9 million contract this week for the second phase of DARPA’s One-Shot system, which will provide direct observations of a target, measure every variable that...