you can fill that box and pay one flat rate. i didn't know the coal thing was real. it's very real... david rivera. rivera, david. [ male announcer ] fedex one rate. simple, flat rate shipping with the reliability of fedex. the american combat mission in afghanistan is supposed to end in 2014, and it's on schedule, but richard engel has obtained a draft of a security agreement between the u.s. and afghanistan which calls for obligations that could keep american troops in that country until 2024, potentially beyond that, if it is agreed to by both sides. joining me now from kabul is nbc's chief foreign correspondent richard engel.