Hello!
Perhaps I should have been more precise in my statement. The official FAA authorized telephony (radio call) of "Ranger", is assigned to a company based out of the United Kingdom. A Bell Helicopter model 206 is known as a Jet Ranger. So, legally, the pilot of a Bell 206 as well as air traffic control, are authorized to use either November, Helicopter, or Jet Ranger. For example, N123BH... Jet Ranger 3 Bravo Hotel, or simply Helicopter 3 Bravo Hotel.
The local radio call of "Ranger", is a locally authorized radio call for certain aircraft, dependent upon the type of mission being flown. As GlobalNorth has pointed out, the state of Arizona does indeed own quite a few rotor-wing and fixed-wing aircraft.
A frequent state-owned flyer to/from Sky Harbor airport is N922AZ. This aircraft is a Beechcraft King Air 200. This aircraft is called "King Air 2 Alpha Zulu", "November 2 Alpha Zulu", or November Niner two two Alpha Zulu. Never once has this aircraft called itself, nor has it ever been referred to as "November Niner 2 Two Alpha Zulu KING". Or at least, not intentionally.
Numerous law enforcement agencies conduct operations with aircraft in and around the Phoenix area. All of them have locally authorized radio callsigns. And they use them on a daily basis. However, when one of the aircraft, for example, must fly out of the locally authorized area, they must use their aircraft registration as a radio call with air traffic control, assuming they elect to use the service. There are however, a few exceptions.
For those of you who monitor air traffic control radio frequencies, I am certain you have heard these radio calls more than a few times.
Steve