Is that the new destroyer they can’t afford any rounds for the single gun it has??
You may be thinking of the Zumwalt Destroyer — originally called DD(X). A few of those have been built and are at sea — but, yes, their primary armament (an advanced gun system) is problematic because of the cost of the ammo. This article is about what they used to call a Guided Missile Cruiser. The article calls it a Guided Missile Destroyer. These are planned but not built.