America uses depleted urainum tiped shells and missiles. First used by US forces illegaly in the first gulf war. The US used about 300 tons of depleted uranium in the invasion of Iraq, leaving much of the country hazardous to both the troops and the Iraqis.
Depleted uranium (Uranium-238) has a half-life of 4.5 billion years, meaning it takes that long to lose half of it's strength, so the 300 tons of uranium spread through Iraq isnt going to fizzle out anytime soon.
Another example of just how much the US cares about the people in Iraq.