The US Navy's radar systems are excellent, but many potential enemies of the US have their own high-quality radar systems, too. That means eliminating enemy radar is a priority when it comes to gaining an advantage.
The AGM-88 HARM is the standard tool for such eliminations; it's an anti-radiation missile that actively seeks out enemy radar installations, and destroys them. The technology in its nosecone can locate electrical activity from over 80 miles away, and the weapon has seen action in both Iraq wars.