The Islamic State organization has been on the losing side for the last year in Syria and Iraq. Pentagon estimated in August that over 25,000 ISIS operators have been killed in the last 11 months, with additional estimate of 20,000 killed in the year before. General MacFarland said estimates for the overall remaining strength of ISIS vary from about 15,000 to 30,000 but said the jihadists are having increasing difficulties replenishing their ranks. Besides heavy casualties, the big losses were also accounted as territory, funds, maneuverability and oil industry.