The US army is seeking proposals for biodegradable ammunition to replace the existing rounds in use, citing environmental concerns.
원문출처 : http://www.cnn.com/2017/02/01/world/biodegradable-bullets-us-army/index.html
원문출처 : http://www.cnn.com/2017/02/01/world/biodegradable-bullets-us-army/index.html