Yes, they are currently combating, aggressively, the group of dudes that call themselves 'Isis'.
That same group of dudes, will, in a year or two, rename themselves, and automagically align with Iran to fight 'some other dudes'.
They do not care what we call them. They just desire the 'power'. And will go after whatever money is out there to get there.
Iran - Iraq war. 8 years of combat. Now 'they' (for various definitions of what Iraq is now) are supposedly aligned in fighting "ISIS". The enemy of my enemy and all that...