I cannot vote here, strange.....
Well my idea is that the soldiers speech should actually
be live. Every soldier is a human, and every healthy human has emotions. I mean, its a bad factor to add speeches like "Ok!", "Yes","No", "Affirmative" pronounced without a feel... it WILL turn the gameplay experience down.
Just look at some youtube Japanese shows, Japanese language is one of those where the pronouncation really matters... or replay a sound difference between normal soldier and commando unit in first Command and Conquer in your head.... this is exactly what makes commando unit very important subconsciously, apart from sniper rifle of course
.