On March 26, the U.S. Navy announced plans to award four firm-fixed-price contracts to develop prototype Unmanned Carrier-Launched Airborne Surveillance and Strike (UCLASS) drones. This is on top of a similar project, already in the works, to develop a fleet of Unmanned Combat Air Systems (UCAS).

Billions of dollars are at stake as each of Boeing (BA 1.68%), Northrop Grumman (NOC 1.26%), Lockheed Martin (LMT 1.31%), and General Atomics lock their targeting radars on these contracts. Who will emerge victorious? With the Pentagon set to spend $5.6 billion on drone purchases this year alone, and more in years to come, it's a question worth asking, and a trend in weapons purchases worth watching.

Motley Fool contributor Rich Smith explains in the following video.