As of August 29, 2016, the Federal Aviation Administration published new rules for unmanned aerial systems (UAS) under Part 107.
The rules not only included operation rules for small UAS, but it also created the Remote Pilot Certificate with a Small UAS Rating, the first and only airman certificate specifically for the use and operation of small UAS.
In order to use a small UAS or drone commercially in the United States, pilots are required to obtain their Remote Pilot Certificate.