Leslie pointed out the old WWII version, which would explain a lot of the small differences where people hung onto those instead of switching to ICAO standard. Ice Station Zebra anyone?
With some law enforcement agencies, there's no telling what they use other than the first thing that pops into their mind with the starting letter.
When I was learning the ICAO version, I'd read license plates. Helped me pick it up pretty quickly. Now, if I could just memorize morse code...
