I meant.
You pay a fee , sit a test, & hopefully ' issued ' with the licence to operate that " allocated " frequency band .
The next category, you sit almost that same test for another frequency band .
So now you have two licences ,H F & VHF . ( marine) .
Sit the same nominal rest again to gain ' Aviation VHF " air to air " . But not for " ground to air . Sit another test to gain another licence, for ' ground controllers licence.
All on top of your " Amateur Radio transmitting " licence .
spacesailor