Forty plus years ATC here, Sydney, Dubai, Kai Tak, Chek Lap Kok, and it never ceased to amaze me how many of my ATC colleagues from North America that I worked with, somehow managed to get things confused. Culturally many of them could not flatten down the Americanisation of their personalities to Keep It Simple Stupid. Now before I'm jumped on, I did use the word "Many" and I did not use the word "all". I'll also add that the "good" North Americans were very good. That sheila was bloody hopeless.