ISIS on the offensive in Iraq

[Husar]

There are some COIN aircraft that use propellers. They are fuel efficient, slow and can usually sport a very decent loadout of rocket launchers, machine guns and small bombs. Certainly good enough to engage some dudes on the ground. Not to forget that a 200km/h propeller machine may actually be better suited for such tasks than a jet that can go Mach 2.

The Bronco was such a plane and used by the US well into the 90ies.
Argentina has the Pucara, the article also has a nice picture with the loadout options.
And the USA are even developing a new one: http://en.wikipedia.org/wiki/US_Aircraft_A-67_Dragon

Probably not enough to stop huge tank formations with air cover, but for hunting Taliban in the mountains they should be fine.