This is quite remarkable:

Here’s a summary of the anti-ISIS bombing campaign: 30,000 fighters – 20,000 killed = 30,000 fighters…

The primary method for killing suspected terrorists is with stand-off precision airstrikes. With regard to the self-declared Islamic State, U.S. officials have repeatedly stated that the pathway to “destroying” the terrorist organization is by killing every one of its current members. …

The problem with this “kill-em’-all with airstrikes” rule, is that it is not working. Pentagon officials claim that at least 25,000 Islamic State fighters have been killed (an anonymous official said 23,000 in November, while on Wednesday, Warren added “about 2,500” more were killed in December.) Remarkably, they also claim that alongside the 25,000 fighters killed, only 6 civilians have “likely” been killed in the seventeen-month air campaign. At the same time, officials admit that the size of the group has remained wholly unchanged. In 2014, the Central Intelligence Agency (CIA) estimated the size of the Islamic State to be between 20,000 and 31,000 fighters, while on Wednesday, Warren again repeated the 30,000 estimate. To summarize the anti-Islamic State bombing calculus: 30,000 – 25,000 = 30,000.

‘Kill-Em-All With Airstrikes’ Is Not Working
http://www.defenseone.com/ideas/2016/01/kill-em-all-airstrikes-not-working/124946/