focused on their fundamental mission. >> mr. dejuany is expected to speak before the u.s. congress latered with. let's bring in our senior international correspondent, nick paton walsh, live with the latest on this. there you have it. more u.s. troops staying longer in afghanistan. it would suggest as president ghani alluded to there that the afghan forces are not prepared to take over fully any time soon. >> reporter: i don't think it's a question of the afghan national security forces being able to match the job that 100,000 sum and nato troops were ever on here. obviously they are less equipped. they're facing the taliban insurgency that has emboldened after years of fighting here. they have attrition rates of their own where the numbers unwittingly yielded tens of thousands from the rank in the past couple of years or so. it's obviously an