US Report Card On Itself In Afghanistan

The number of insider attacks (Afghans in uniform attacking their Coalition partners) has been on the rise, from two attacks in 2008 to 46 attacks in 2012. The 2012 attacks resulted in 62 Coalition deaths, 35 of them U.S. personnel. 

This accounts for more than 11% of all U.S. casualties and 15% of all U.S. casualties resulting from hostile actions in 2012. 
Full Report