Thanks very much for the question. When you were asking it, I was trying to remember some of my experiences on the language issue back when I was in Afghanistan.
It's a very complex environment with respect to language, because you have major ethnic groups. You made mention of the Pashtuns. There is a unifying language that is used, which most if not all Afghans can speak. I'm just trying to remember what it is. It's not Pashto. Forgive me, but the name just escapes me right now.
The way we interact in the environment there is through interpreters. Interpreters are an invaluable resource. They are very, very carefully screened, and we find that we operate extremely well with them. Many times, a lot of the interpreters who I ran into actually had family connections back in Canada, or the United States, or wherever, which actually accounted for their linguistic ability. But they are carefully screened with a very rigorous process of checks to avoid the exact thing you described. I would extend that to the Afghan national security forces as well, where there is a very extensive program of identification and background checks before we accept these people into our training.