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Yes. So that they can understand each other. Imagine having a Chinese man and an Irish man together on a squad. They would not understand each other and you cannot fight a war without good communication. They were not only divided by ethnicity but by tribe as well. Many of them could not speak English so yes, I agree because it made sense. Take some time and think about it.

I don't agree with you. If you talk the same, you think the same, you become very predictable, no? 😀 😃 😄

Things have to be tested by real results. What is practical and works well is often implemented after trail and error. Maybe they had them mixed up and everything became confusing. Predictable would only have been a problem if they were inefficient. They were not. They were better trained than any African fighting forces before them. Except maybe the Venda's. http://military.wikia.com/wiki/Venda_Defence_Force