Sorry Im a bit late on this...
To refuel a heli...
The helo extends its boom past the rotor disk area
and the KC-130 (or MC-130 ive heard has refueling capabilities for special missions) extends the drouge line out of the turbulance. The two then mate with each other with the 130 at min speed and the helo at max. speed. The tanker then transfers fuel. I have a hard time seeing this done in OFP, and expecially the regular jets refueling from a tanker, due to poor flight models.
I also know that Janes' F-15 has in-flight refueling, and it is hard, too.