From the Summary: "The United Nations Assistance Mission to Afghanistan (UNAMA) reports casualty data of Afghan civilians semiannually, and the U.S. Department of Defense occasionally includes civilian casualty figures within its reports on Afghanistan. From July 2009 through April 2010, the Special Inspector General for Afghanistan Reconstruction (SIGAR) included statistics of casualties of members of the Afghan National Army and Afghan National Police in its quarterly reports to Congress. SIGAR has ceased this practice, and there is no other published compilation of these statistics. This report now derives casualty figures of Afghan soldiers and police from the press accounts of the Reuters 'Factbox: Security Developments in Afghanistan' series and the Pajhwok Afghan News agency. Both services attribute their reported information to officials of the NATO-led ISAF or local Afghan officials. Pajhwok Afghan News frequently concludes its accounts with statements from representatives of the Taliban, however, these figures are not included in this report. Because the estimates of Afghan casualties contained in this report are based on varying time periods and have been created using different methodologies, readers should exercise caution when using them and should look to them as guideposts rather than as statements of fact."
CRS Report for Congress, R41084