article_snippet: The U.S. Army has begun the process of destroying The United States's last supplies of chemical weapons which are contained in almost 800,000 artillery shells.
article_snippet: The first batch of its mustard chemical agent was destroyed after scientists used explosives to open up a sealed container and flooded The first batch of the mustard agent with a second chemical to neutralise the liquid.
article_snippet: It is estimated that there are 2,600 tonnes of its mustard chemical agent contained within 780,000 shells at the facility.
article_snippet: It's being destroyed under a 1997 international treaty banning all chemical weapons.
article_snippet: Another 523 tons of mustard and deadly nerve agents are stored at Blue Grass Army Depot in Kentucky.
article_snippet: The U.S. acquired 30,600 tons of mustard and nerve agents, but The U.S. never used 30,600 tons of mustard and nerve agents in war.
article_snippet: Nearly 90 per cent of The U.S. original stockpile has already been destroyed, mostly by incineration.
highlights_snippet: The United States agreed to destroy The United States mustard chemical agent in 1997 .
  
highlights_snippet: The United States stockpiled almost 3,000 tonnes of the liquid .