These cost savings are the reason commercial drones are expected to be one of the fastest growing industries in the world in the next five years.

A recent report from consulting firm PriceWaterhouseCoopers predicts that the global market for commercial applications will grow to $127 billion by 2020 from just $2 billion today.

One way to profit from the booming drone industry is with large defense contractors such as Lockheed Martin (NYSE: LMT) or Boeing (NYSE: BA). However, I see a problem with these global leaders.