Aviation Week & Space Technology has the story, but it’s behind the paywall.
A Marine MV-22B fires an APKWS guided rocket during trials.
The APKWS is the Advanced Precision Kill Weapon System. You have to look fairly closely to see the rocket leaving the pod mounted to the port cheek of the fuselage.
APKWS takes an unguided 70mm Hydra rocket. Hydra rockets are modular. There are various motor and warhead configurations that can be mixed and matched. The APKWS is a guidance section. Unscrew the warhead from the motor section, screw the APKWS to the motor, and the warhead to the guidance section. Suddenly, you have a guided missile that’s very precise, and has a much longer effective range than an unguided rocket. It has a small warhead, but its quite sufficient to take out a truck, other unarmored vehicle, gun emplacement or similar target. And it is comparatively cheap, as opposed to say, a Hellfire missile.