RPG's work a treat at close range....and can be used in the anti-aircraft artillery (flak) mode if the Insurgents have the proper training and right model warheads. I see they have .51's....which are proper anti-helicopter kit as many of our Old'Un's can testify.
I just viewed a really neat video of an RAF Wokka that got plugged a while back in the Stan......this link will take you to it if the pprune software will allow it.
Pilot Takes Headshot, Then Flies ? Military Videos - Military.com