 Reports of the number of militant versus civilian casualties differ.In general, the CIA and other American agencies have claimed a high rate of militant killings, relying in part on a disputed estimation method that "counts all military-age males in a strike zone as combatants ... unless there is explicit intelligence posthumously proving them innocent".For instance, the CIA has claimed that strikes conducted between May 2010 and August 2011 killed over 600 militants without any civilian fatalities, a claim that many have disputed.