A judge decided government prosecutors did not adequately consider the airman's defense that the flagged substance could've been tainted pre-workout power.
The sixth-generation F-47 will replace the F-22 Raptor, have advanced engines and stealth and fly with drone wingmen called collaborative combat aircraft.
Industry and military drone operators flew tethered and untethered first-person drones through a course designed to test endurance and maneuverability.
