Back in the 1990s, I met this old coot who drove out of Anchorage Taxi (the red and white cabs).  He told me that he first started driving cab in Ketchikan in 1953 and that back then, you were required to have an FCC license to talk on the dispatch radio.  In my own experience, I was on the board of directors of a license holder in 1989 and at that time, DJs were required to have an FCC license.  It looked like a Social Security card, except that it was on yellow paper.  More recently, I did a weekly airshift for years at another station.  While we were made to jump through various hoops by station management, getting an FCC license was not one of those.