along the afghan/pakistani border. gunmen torching dozens of tankers in seven separate attacks depriving combat forces of their supplies. richard lui is here with a much better look at how this block aid is impacting u.s. troops and that is really the key question here, lui. 150,000 some odd troops from the nato forces and of that there are about 90,000 u.s. troops and i ll show you what that looks like on this map. 90,000 u.s. troops that are now stationed there. afghanistan is land locked. that s the challenge getting in the supplies from the arabian sea or caspian sea. the major crossings are up here in the north and in the south and that s chamin. 70% of all supplies go through that route. through the port of karachi. that is about a 24-hour drive, that is about a 1,200 mile