A spokesperson for US CENTCOM recently admitted the U.S. used uranium coated ammunition in late 2015.
In 2003 Iraqi civilians and the Iraqi government expressed outrage over the use of ammunition that contained depleted uranium. The use of such weapons is highly controversial as the potential health affects are hazardous but also not fully known. The U.S. claims the ammo is needed to pierce heavily armored vehicles. The uranium makes for tougher bullets. As Foreign Policy reports in March 2015, coalition spokesman John Moore said, “U.S. and coalition aircraft have not been and will not be using depleted uranium munitions in Iraq or Syria during Operation Inherent Resolve.” However, the U.S. recently revealed that Uranium coated bullets were used in late 2015 on oil tankers. Of note is that the tankers were not armored and appeared to be civilian tankers.
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