Pentagon Says Airstrikes ’Not Enough’ to Eradicate ISIL

Pentagon spokesman told the reporters that the international campaign against ISIL will not be easy and quick, calling on them to avoid overestimating the outcomes of the airstrikes.
 
The US has to support the so-called "moderate rebels" in Syria and the Iraqi army in order to be able to carry out the mission.
 
It is worth noting that US president Barack Obama considered that depending on the so-called "moderate rebels" in Syria to defeat the regular army is a mere fancy.