Hi,
Wannabe military publications have always told me that depleted uranium ammunition is designed for its ability to throw a lot of kinetic energy at modern armour systems. Probably not what you'd want to throw at lightly- or un-armoured Afghanistan-style bad guys anyway, you'd have thought?
I think the concern with DU is not so much for the recipient but for more or less anyone who happens to be downwind for the next quarter of a million years.
Phil