Yes, the primary use case was in various direct-fire cannon systems, which have become less prevalent over time due to limited range. It still has use cases in auto-cannons because it significantly improves their performance against armored vehicles and allows them to go up against armor that may outgun them.

It isn’t just used in munitions, it is a component of heavy armor. When you blow up a tank you may be vaporizing some depleted uranium in its hull.