PN,
As already stated, the USMC has RO/RO HARVEST HAWK kits for the KC-130J fleet. The main components are: an internally fitted pallet with WSO control consoles, a Gunslinger launcher for Griffin missiles on the ramp, Hellfire missiles on an under wing pylon, and a sensor ball as used on the AH-1Z mounted below an under wing fuel tank. Used in Afghanistan to effect.
Control Module:
Gunslinger Launcher:
Hellfire Pylon:
Sensor Ball:
HARVEST HAWK:
https://www.youtube.com/watch?v=ERzT8KoVY7k
Gunslinger launched Griffin:
https://www.youtube.com/watch?v=mk1Me_AKxxU