In an effort to become more environmentally correct, the U.S. id planning to switch from bullets containing lead to ones using a tungsten-tin alloy. No evidence has been presented to show environmental damage from the current lead bullets used by American troops, but the U.S Environmental Protection Agency insists that it exists, somewhere. Weapons experts point out that the new bullet is less likely to cause disabling wounds, leaving enemy soldiers still capable of resisting after being hit (lead bullets fragment inside their target, the new bullets keep going.). The new bullets also cause more barrel wear, rendering weapons inaccurate after a few thousand rounds. The new bullets are more expensive, and 83 percent of the tungsten and tin needed to make them has to be imported, from places like China and other nations.