will inherit the country that the coalition troops leave behind. 24ed nearly nasria and 27-year-old habib graduated last year. both of them fled afghanistan during the 1990s as the brutal civil war took hold. now nasria worries that the u.s. troops are withdrawing too soon. >> i would call it a mistake but that may not be the right word. >> reporter: by 2011 coalition troops will have spent $40 billion to recruit, train, and equip the afghan forces the trouble is many afghans don't believe their own security forces are up for the job. in fact a recent report from nato came to the same conclusion. it found even after ten years of working with coalition troops, afghan forces still suffer from poor training, lack of professionalism, and corruption. with afghan troops not ready and american support dwindling, there's also fear the taliban might come back. >> reporter: the heaviest price so far has been paid by the afghans themselves. according to the u.n., more than 8,000 civilians have been killed in the last four years of this war. mandy clark, cbs news, kabul. >> pelley: as david martin me