Vigilant Aerospace Systems CEO Kraettli Epperson, left, and NASA Armstrong Flight Research Center Director David McBride, sign the agreement for the company to commercialize a large drone communication system for the Federal Aviation Administration's aircraft tracking system called the Automatic Dependent Surveillance Broadcast. This communication system, which is to be mandated by the FAA for most aircraft in 2020, brings large, unmanned aircraft a step closer to flying in the National Airspace System.