NEW : Gates says Afghan troops will eventually leave the United States . NEW : We will not have an effective growth of Afghan security forces '' with the private firms still operational . Transition to American security control will begin Thursday , he says . NEW : NATO says parliamentary candidate wounded in airstrike .
NEW : Gates says Afghan troops will eventually leave the United States . NEW : Transition to American security control will begin Thursday , he says . NEW : NATO says parliamentary candidate wounded in airstrike .