"I was wondering why a standard uniform has never been established for controllers to wear?....with it's own epaulette system! One stripe for trainee's, two for ATCO's, three for SATCO's etc. "
I think that in the past EGNT and IAL (OMAA/OMDB etc.) had uniforms, which were awful. So, in 2009 the answer is simple: nobody would wear it
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Imperator 1300