The U.S. Army wants to use biodegradable ammunition during training exercises, due in large part to how existing bullets can corrode and pollute the soil and water.
Magic bullets: US Army pursues 'biodegradable' ammunition
Magic bullets: US Army pursues 'biodegradable' ammunition
U.S. Army Seeks Biodegradable Bullets to Limit Soil, Water Corrosion
Magic bullets: US Army pursues 'biodegradable' ammunition