On a chilly Thursday morning, scores of drone manufacturers, investors and military officials gather on the rolling hills of the Pendleton drone range for a demonstration.“Hey everyone. I’m really motivated to keep things brief,” says Yuri Kurat, bundled against the wind as he prepares his drones.Kurat is the founder of Ocko Navigation, which makes a black box that can strap onto a drone, enabling the drone to navigate without GPS.“Electronic wa…