Please.
In any case, they are a military necessity. You'll need some real proof of a problem for a case to get rid of them, and by extension require the reconstruction of our armor corps.
Why are they a military necessity? The US only attacks weak countries, much like the Brits mowing down the hottentots with gattling guns, so it shouldn't need very advanced military gear.
Two things:
1. War with, say, China, is still quite possible in the future.
2. Even so-called 'weak' countries have armored tanks and vehicles. Pre-1991, the Iraqis had them. Depleted-uranium is one reason why post-Gulf War they did not...
And to answer that, depleted-uranium is only a WMD in a very loose sense of the term that would also consider dyanamite a WMD (a mass that destroys; almost all explosive weapons are thus WMDs). Why? It's just a chunk of heavy metal, even if it's got a little radiation.
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