The World has determined that using depleted uranium tipped missiles and smart munitions bunker busters is polluting the battle space; and once the war is over that area is unsafe with radiation issues. Many nations are using such strategies on their weapons because those tips cut like butter through steel and re-enforced underground bunkers.

Thus, we need a solution and we need one quick. Why? Well, because many rogue nations that are now manufacturing nuclear weapons and they are doing it underground to prevent interference. Without specially tipped rounds, missile and smart bombs to deal with this, we'll have to use a greater explosion and that means more potential for collateral damage. No one wants that.

So, perhaps there is a solution, let me explain, first a quick background. According to an article in Physics dot org:

"wurtzite boron nitride (w-BN) has a greater indentation strength than diamond. The scientists also calculated that another material, lonsdaleite (also called hexagonal diamond, since it's made of carbon and is similar to diamond), is even stronger than w-BN and 58 percent stronger than diamond, setting a new record."

Cite: Pan, Zicheng; Sun, Hong; Zhang, Yi; and Chen, Changfeng. "Harder than Diamond: Superior Indentation Strength of Wurtzite BN and Lonsdaleite." Physical Review Letters 102, 055503 (2009).

By using w-BN something we can make here in the US as we have Boron Mines, we can solve this problem, make warfare safer, and reduce collateral damage thru surgical strikes on only the facilities which threaten the world. This is only one of several solutions proposed, but one I personally favor. Think on this.