H/T to Milaerospace. Lockheed Martin has been awarded a $93.7 million contract modification on Apr. 8 to add a terrain following radar on the MC-130J.
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By Airwolfhound from Hertfordshire, UK (MC-130 Hercules – RAF Mildenhall) [CC BY-SA 2.0], via Wikimedia Commons
The radar model is likely the Silent Knight from Raytheon. Having such a radar will allow the pilots to fly as low as 100 feet above the ground.