Bibles in Afgan languages could only be there for prosletyzing. The troops have no business promoting any religion over there and the organization that sent them should know better.
Then why are our troops dying to preserve Islam?
There do exist Afghan Christians, and to my knowledge, it is not against the law in modern Afghanistan to have a Bible (in any language) in one’s possession. Afghanistan is not supposed to be subject to the whims of the Taliban any longer, and justifying their killing of these people does not help Afghanistan in any way.
There are thousands of Christians in Afghanistan and many of them don't read English.
Therefore you statement is erroneous.
Although there are no explicit laws that forbid proselytizing, many authorities and most of society view the practice as contrary to the beliefs of IslamAlso see this article:
... the organization that sent them [Bibles] should know better.
Secret World of Afghan Christians
Imprisoned Convert One of Thousands in Afghanistan
Now you know better...
: > )