Currently, this year, you do not need a "license" to fly R/C in the U.S. as long as it is for recreational purposes, below 55 lbs. However, the FAA requires all R/C pilots to register and put their registration number on each plane/drone/etc. If you do any R/C flying for compensation, even YouTube, you must also have an FAA Remote Pilot Certificate (also known as a "Part 107 license"). I have a Part 107 license, which is granted by the FAA by simply asking for it because I have numerous other FAA certificates: ATP, CFI/II/MEI, etc.