The license is a permit to be in possession of State property. If you get that then you much more insight ought to follow. As has been related before, to become a cop in State of Pennsylvania a person has to have a Pennsylvania driver license? Why? To take the part of the mandated training for police car operations, you need permission to be in possession of District-State property. Otherwise, how can you 'legally' 'drive' a police car?
Resident != private. Not domestic != State or Federal.