Since 2007, at Least $3 Billion Has Left Afghanistan by Plane in Boxes and Suitcases http://cryptogon.com/?p=16313

Since invading Afghanistan in 2001, the United States alone has invested almost $300 billion in military and reconstruction efforts there. But far less progress has been made than what was either hoped for or expected. One major reason for this could be the fact that a significant portion of the millions meant for reconstructive efforts continue to be siphoned off. The people benefiting are often those who enjoy extremely close business ties with the donor countries.