Dead horse discussion but I see a compelling reason to use the term “units”. New pilots deal with strange concepts like heading and attitude which, among other things, are measured in “degrees”. Angles are everywhere In a civilian pilot’s world. And the budding fighter student must deal with many more. In both cases, their Instructors fight a big battle early on trying to mentally separate attitude from AOA in the minds of their students. Using different terms for the two helps facilitate the separation.
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That’s a good point to bring up, never looked at it from that angle(hur hur hur). I think the Mig-21 also deals in units as opposed to angle.
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Damn you and your jokes. I got calld out for giggling too loud. 
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I hope coffee was involved too?! 