Some of us who the military trained in Vail System/American Standard Morse as well as International Morse as used by amateur and other radio operations can be a little sketchy on their diddydahs though. And pity the poor Russian hams who have to deal with a Cyrillic alphabet....
Thankfully, NATO went with the international version in the mid-1960s. But not before some of us became more familiar with a system immediately recognizable by a railroad brasspounder of a century before. -archy-/-
I was just an air traffic controller, they didn't teach me squat. I learned Morse code on my own, to get a Ham license. I was controlling airplanes for 11 years, and still did not have a clue how radio waves propagate. I only learned that when I got a Ham license. It got to be like second nature. I knew what freq to get on for the distance I wanted to go, and the time of day to do it. Most people probably do not know that the majority of HF communications only works during daylight hours, and not at night.